diff --git a/sources/AUTHORS b/sources/AUTHORS
index f104070..89a2af3 100644
--- a/sources/AUTHORS
+++ b/sources/AUTHORS
@@ -1,2 +1,2 @@
-The project has been started by Alexis Métaireau and Frédéric Sureau. Friends are 
+The project has been started by Alexis Métaireau and Frédéric Sureau. Friends are
 helping since that in the persons of Arnaud Bos and Quentin Roy.
diff --git a/sources/LICENSE b/sources/LICENSE
index a668284..ecc7977 100644
--- a/sources/LICENSE
+++ b/sources/LICENSE
@@ -19,7 +19,7 @@ that the following conditions are met:
   promote products derived from this software without specific
   prior written permission.
 
-* If you meet the authors of this software in person and you want to 
+* If you meet the authors of this software in person and you want to
   pay them a beer, you're encouraged to do so. Please, do. If you have
   homebrewed beer, this works as well (may even be better).
 
diff --git a/sources/budget/default_settings.py b/sources/budget/default_settings.py
index 111abf2..d5a9a9b 100644
--- a/sources/budget/default_settings.py
+++ b/sources/budget/default_settings.py
@@ -3,9 +3,4 @@ SQLALCHEMY_DATABASE_URI = 'sqlite:///budget.db'
 SQLACHEMY_ECHO = DEBUG
 SECRET_KEY = "tralala"
 
-DEFAULT_MAIL_SENDER = ("Budget manager", "budget@notmyidea.org")
-
-try:
-    from settings import *
-except ImportError:
-    pass
+MAIL_DEFAULT_SENDER = ("Budget manager", "budget@notmyidea.org")
diff --git a/sources/budget/forms.py b/sources/budget/forms.py
index 2dde57d..7d6eb51 100644
--- a/sources/budget/forms.py
+++ b/sources/budget/forms.py
@@ -152,27 +152,35 @@ class BillForm(Form):
 class MemberForm(Form):
 
     name = TextField(_("Name"), validators=[Required()])
+    weight = CommaDecimalField(_("Weight"), default=1)
     submit = SubmitField(_("Add"))
 
-    def __init__(self, project, *args, **kwargs):
+    def __init__(self, project, edit=False, *args, **kwargs):
         super(MemberForm, self).__init__(*args, **kwargs)
         self.project = project
+        self.edit = edit
 
     def validate_name(form, field):
         if field.data == form.name.default:
             raise ValidationError(_("User name incorrect"))
-        if Person.query.filter(Person.name == field.data)\
-                .filter(Person.project == form.project)\
-                .filter(Person.activated == True).all():
+        if (not form.edit and Person.query.filter(
+                Person.name == field.data,
+                Person.project == form.project,
+                Person.activated == True).all()):
             raise ValidationError(_("This project already have this member"))
 
     def save(self, project, person):
         # if the user is already bound to the project, just reactivate him
         person.name = self.name.data
         person.project = project
+        person.weight = self.weight.data
 
         return person
 
+    def fill(self, member):
+        self.name.data = member.name
+        self.weight.data = member.weight
+
 
 class InviteForm(Form):
     emails = TextAreaField(_("People to notify"))
diff --git a/sources/budget/manage.py b/sources/budget/manage.py
new file mode 100755
index 0000000..e0b25a7
--- /dev/null
+++ b/sources/budget/manage.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+from flask.ext.script import Manager
+from flask.ext.migrate import Migrate, MigrateCommand
+
+from run import app
+from models import db
+
+migrate = Migrate(app, db)
+
+manager = Manager(app)
+manager.add_command('db', MigrateCommand)
+
+
+if __name__ == '__main__':
+    manager.run()
diff --git a/sources/budget/merged_settings.py b/sources/budget/merged_settings.py
new file mode 100644
index 0000000..f6b1f81
--- /dev/null
+++ b/sources/budget/merged_settings.py
@@ -0,0 +1,10 @@
+"""
+Merges default settings with user-defined settings
+"""
+
+from default_settings import *
+
+try:
+    from settings import *
+except ImportError:
+    pass
diff --git a/sources/budget/migrations/README b/sources/budget/migrations/README
new file mode 100755
index 0000000..98e4f9c
--- /dev/null
+++ b/sources/budget/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/sources/budget/migrations/alembic.ini b/sources/budget/migrations/alembic.ini
new file mode 100644
index 0000000..f8ed480
--- /dev/null
+++ b/sources/budget/migrations/alembic.ini
@@ -0,0 +1,45 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/sources/budget/migrations/env.py b/sources/budget/migrations/env.py
new file mode 100755
index 0000000..cef89d2
--- /dev/null
+++ b/sources/budget/migrations/env.py
@@ -0,0 +1,85 @@
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+import logging
+
+# This is the Alembic Config object, which provides access to the values within
+# the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.  This line sets up loggers
+# basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# Add your model's MetaData object here for 'autogenerate' support from myapp
+# import mymodel target_metadata = mymodel.Base.metadata.
+from flask import current_app
+config.set_main_option('sqlalchemy.url',
+                       current_app.config.get('SQLALCHEMY_DATABASE_URI'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# Other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # This callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema.
+    # reference: http://alembic.readthedocs.org/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    engine = engine_from_config(config.get_section(config.config_ini_section),
+                                prefix='sqlalchemy.',
+                                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(connection=connection,
+                      target_metadata=target_metadata,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/sources/budget/migrations/script.py.mako b/sources/budget/migrations/script.py.mako
new file mode 100755
index 0000000..9570201
--- /dev/null
+++ b/sources/budget/migrations/script.py.mako
@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/sources/budget/migrations/versions/26d6a218c329_.py b/sources/budget/migrations/versions/26d6a218c329_.py
new file mode 100644
index 0000000..859b9af
--- /dev/null
+++ b/sources/budget/migrations/versions/26d6a218c329_.py
@@ -0,0 +1,26 @@
+"""Add Person.weight column
+
+Revision ID: 26d6a218c329
+Revises: b9a10d5d63ce
+Create Date: 2016-06-15 09:22:04.069447
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '26d6a218c329'
+down_revision = 'b9a10d5d63ce'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('person', sa.Column('weight', sa.Float(), nullable=True))
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('person', 'weight')
+    ### end Alembic commands ###
diff --git a/sources/budget/migrations/versions/b9a10d5d63ce_.py b/sources/budget/migrations/versions/b9a10d5d63ce_.py
new file mode 100644
index 0000000..92bb446
--- /dev/null
+++ b/sources/budget/migrations/versions/b9a10d5d63ce_.py
@@ -0,0 +1,68 @@
+"""Initial migration
+
+Revision ID: b9a10d5d63ce
+Revises: None
+Create Date: 2016-05-21 23:21:21.605076
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'b9a10d5d63ce'
+down_revision = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('project',
+    sa.Column('id', sa.String(length=64), nullable=False),
+    sa.Column('name', sa.UnicodeText(), nullable=True),
+    sa.Column('password', sa.String(length=128), nullable=True),
+    sa.Column('contact_email', sa.String(length=128), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('archive',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('project_id', sa.String(length=64), nullable=True),
+    sa.Column('name', sa.UnicodeText(), nullable=True),
+    sa.ForeignKeyConstraint(['project_id'], ['project.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('person',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('project_id', sa.String(length=64), nullable=True),
+    sa.Column('name', sa.UnicodeText(), nullable=True),
+    sa.Column('activated', sa.Boolean(), nullable=True),
+    sa.ForeignKeyConstraint(['project_id'], ['project.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('bill',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('payer_id', sa.Integer(), nullable=True),
+    sa.Column('amount', sa.Float(), nullable=True),
+    sa.Column('date', sa.Date(), nullable=True),
+    sa.Column('what', sa.UnicodeText(), nullable=True),
+    sa.Column('archive', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['archive'], ['archive.id'], ),
+    sa.ForeignKeyConstraint(['payer_id'], ['person.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('billowers',
+    sa.Column('bill_id', sa.Integer(), nullable=True),
+    sa.Column('person_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['bill_id'], ['bill.id'], ),
+    sa.ForeignKeyConstraint(['person_id'], ['person.id'], )
+    )
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('billowers')
+    op.drop_table('bill')
+    op.drop_table('person')
+    op.drop_table('archive')
+    op.drop_table('project')
+    ### end Alembic commands ###
diff --git a/sources/budget/migrations/versions/f629c8ef4ab0_initialize_all_members_weights_to_1.py b/sources/budget/migrations/versions/f629c8ef4ab0_initialize_all_members_weights_to_1.py
new file mode 100644
index 0000000..5542146
--- /dev/null
+++ b/sources/budget/migrations/versions/f629c8ef4ab0_initialize_all_members_weights_to_1.py
@@ -0,0 +1,39 @@
+"""Initialize all members weights to 1
+
+Revision ID: f629c8ef4ab0
+Revises: 26d6a218c329
+Create Date: 2016-06-15 09:40:30.400862
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'f629c8ef4ab0'
+down_revision = '26d6a218c329'
+
+from alembic import op
+import sqlalchemy as sa
+
+# Snapshot of the person table
+person_helper = sa.Table(
+    'person', sa.MetaData(),
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('project_id', sa.String(length=64), nullable=True),
+    sa.Column('name', sa.UnicodeText(), nullable=True),
+    sa.Column('activated', sa.Boolean(), nullable=True),
+    sa.Column('weight', sa.Float(), nullable=True),
+    sa.ForeignKeyConstraint(['project_id'], ['project.id'], ),
+    sa.PrimaryKeyConstraint('id')
+)
+
+
+def upgrade():
+    op.execute(
+        person_helper.update()
+        .where(person_helper.c.weight == None)
+        .values(weight=1)
+    )
+
+
+def downgrade():
+    # Downgrade path is not possible, because information has been lost.
+    pass
diff --git a/sources/budget/models.py b/sources/budget/models.py
index 27bd80b..852b3e1 100644
--- a/sources/budget/models.py
+++ b/sources/budget/models.py
@@ -40,8 +40,9 @@ class Project(db.Model):
             bills = Bill.query.filter(Bill.owers.contains(person))
             for bill in bills.all():
                 if person != bill.payer:
-                    should_pay[person] += bill.pay_each()
-                    should_receive[bill.payer] += bill.pay_each()
+                    share = bill.pay_each() * person.weight
+                    should_pay[person] += share
+                    should_receive[bill.payer] += share
 
         for person in self.members:
             balance = should_receive[person] - should_pay[person]
@@ -49,6 +50,10 @@ class Project(db.Model):
 
         return balances
 
+    @property
+    def uses_weights(self):
+        return len([i for i in self.members if i.weight != 1]) > 0
+
     def get_transactions_to_settle_bill(self):
         """Return a list of transactions that could be made to settle the bill"""
         #cache value for better performance
@@ -62,7 +67,7 @@ class Project(db.Model):
                 debts.append({"person": person, "balance": -balance[person.id]})
         # Try and find exact matches
         for credit in credits:
-            match = self.exactmatch(credit["balance"], debts)
+            match = self.exactmatch(round(credit["balance"], 2), debts)
             if match:
                 for m in match:
                     transactions.append({"ower": m["person"], "receiver": credit["person"], "amount": m["balance"]})
@@ -152,13 +157,14 @@ class Person(db.Model):
 
     query_class = PersonQuery
 
-    _to_serialize = ("id", "name", "activated")
+    _to_serialize = ("id", "name", "weight", "activated")
 
     id = db.Column(db.Integer, primary_key=True)
     project_id = db.Column(db.String(64), db.ForeignKey("project.id"))
     bills = db.relationship("Bill", backref="payer")
 
     name = db.Column(db.UnicodeText)
+    weight = db.Column(db.Float, default=1)
     activated = db.Column(db.Boolean, default=True)
 
     def has_bills(self):
@@ -217,9 +223,10 @@ class Bill(db.Model):
     archive = db.Column(db.Integer, db.ForeignKey("archive.id"))
 
     def pay_each(self):
-        """Compute what each person has to pay"""
+        """Compute what each share has to pay"""
 	if self.owers:
-		return self.amount / len(self.owers)
+                # FIXME: SQL might dot that more efficiently
+		return self.amount / sum(i.weight for i in self.owers)
 	else:
 		return 0
 
diff --git a/sources/budget/requirements.txt b/sources/budget/requirements.txt
index 87d8966..d49767e 100644
--- a/sources/budget/requirements.txt
+++ b/sources/budget/requirements.txt
@@ -1,7 +1,8 @@
 flask>=0.9
 flask-wtf==0.8
 flask-sqlalchemy
-flask-mail
+flask-mail>=0.8
+Flask-Migrate==1.8.0
 flask-babel
 flask-rest
 jinja2==2.6
diff --git a/sources/budget/run.py b/sources/budget/run.py
index dace736..a7ce25e 100644
--- a/sources/budget/run.py
+++ b/sources/budget/run.py
@@ -1,22 +1,56 @@
+import os
+import warnings
+
 from flask import Flask, g, request, session
 from flask.ext.babel import Babel
+from flask.ext.migrate import Migrate, upgrade
 from raven.contrib.flask import Sentry
 
 from web import main, db, mail
 from api import api
-from utils import ReverseProxied
+from utils import PrefixedWSGI
+from utils import minimal_round
+
 
 app = Flask(__name__)
-app.config.from_object("default_settings")
-app.wsgi_app = ReverseProxied(app.wsgi_app, app.config['APPLICATION_ROOT'])
+
+
+def configure():
+    """ A way to (re)configure the app, specially reset the settings
+    """
+    config_obj = os.environ.get('FLASK_SETTINGS_MODULE', 'merged_settings')
+    app.config.from_object(config_obj)
+    app.wsgi_app = PrefixedWSGI(app)
+
+    # Deprecations
+    if 'DEFAULT_MAIL_SENDER' in app.config:
+        # Since flask-mail  0.8
+        warnings.warn(
+            "DEFAULT_MAIL_SENDER is deprecated in favor of MAIL_DEFAULT_SENDER"
+            +" and will be removed in further version",
+            UserWarning
+        )
+        if not 'MAIL_DEFAULT_SENDER' in app.config:
+            app.config['MAIL_DEFAULT_SENDER'] = DEFAULT_MAIL_SENDER
+
+configure()
 
 app.register_blueprint(main)
 app.register_blueprint(api)
 
+# custom jinja2 filters
+app.jinja_env.filters['minimal_round'] = minimal_round
+
 # db
 db.init_app(app)
 db.app = app
-db.create_all()
+
+# db migrations
+migrate = Migrate(app, db)
+
+# auto-execute migrations on runtime
+with app.app_context():
+    upgrade()
 
 # mail
 mail.init_app(app)
diff --git a/sources/budget/static/css/main.css b/sources/budget/static/css/main.css
index 3274241..f3fe8a0 100644
--- a/sources/budget/static/css/main.css
+++ b/sources/budget/static/css/main.css
@@ -176,11 +176,16 @@ tr.payer_line .balance-name{
     color: red;
 }
 
+.edit button, .edit button:hover {
+    background: url('../images/edit.png') left no-repeat;
+
+}
+
 .reactivate button, .reactivate button:hover {
     background: url('../images/reactivate.png') left no-repeat;
     color: white;
 }
-    
+
 #bill-form > fieldset {
     margin-top: 10px;
 }
@@ -189,6 +194,18 @@ tr.payer_line .balance-name{
     position: absolute;
 }
 
+.light {
+    opacity: 0.3;
+}
+
+.extra-info {
+    display: none;
+}
+
+tr:hover .extra-info {
+    display: inline;
+}
+
 .modal-body {
     max-height:455px;
 }
@@ -208,4 +225,3 @@ tr.payer_line .balance-name{
 .row-fluid > .offset3{margin-left:25.5%;}
 .row-fluid > .offset2{margin-left:17%;}
 .row-fluid > .offset1{margin-left:8.5%;}
-
diff --git a/sources/budget/templates/authenticate.html b/sources/budget/templates/authenticate.html
index dc62a70..98914d0 100644
--- a/sources/budget/templates/authenticate.html
+++ b/sources/budget/templates/authenticate.html
@@ -3,7 +3,7 @@
 <h2>Authentication</h2>
 
 {% if create_project %}
-<p class="info">{{ _("The project you are trying to access do not exist, do you want 
+<p class="info">{{ _("The project you are trying to access do not exist, do you want
 to") }} <a href="{{ url_for(".create_project", project_id=create_project) }}">{{ _("create it") }}</a>{{ _("?") }}
 </p>
 {% endif %}
diff --git a/sources/budget/templates/edit_member.html b/sources/budget/templates/edit_member.html
new file mode 100644
index 0000000..5f097f9
--- /dev/null
+++ b/sources/budget/templates/edit_member.html
@@ -0,0 +1,17 @@
+{% extends "layout.html" %}
+
+{% block js %}
+    $('#cancel-form').click(function(){location.href={{ url_for(".list_bills") }};});
+{% endblock %}
+
+
+{% block top_menu %}
+<a href="{{ url_for(".list_bills") }}">{{ _("Back to the list") }}</a>
+{% endblock %}
+
+{% block content %}
+
+<form class="form-horizontal" method="post">
+    {{ forms.edit_member(form, edit) }}
+</form>
+{% endblock %}
diff --git a/sources/budget/templates/forms.html b/sources/budget/templates/forms.html
index 2904e0d..07e5b3d 100644
--- a/sources/budget/templates/forms.html
+++ b/sources/budget/templates/forms.html
@@ -76,12 +76,12 @@
     <fieldset>
         {% if title %}<legend>{% if edit %}{{ _("Edit this bill") }} {% else %}{{ _("Add a bill") }} {% endif %}</legend>{% endif %}
     {% include "display_errors.html" %}
-    {{ form.hidden_tag() }} 
-    {{ input(form.date, class="datepicker") }} 
-    {{ input(form.what) }} 
-    {{ input(form.payer) }} 
-    {{ input(form.amount) }} 
-    {{ input(form.payed_for) }} 
+    {{ form.hidden_tag() }}
+    {{ input(form.date, class="datepicker") }}
+    {{ input(form.what) }}
+    {{ input(form.payer) }}
+    {{ input(form.amount) }}
+    {{ input(form.payed_for) }}
     </fieldset>
     <div class="actions">
         {{ form.submit(class="btn btn-primary") }}
@@ -95,6 +95,20 @@
 {{ form.name(placeholder=_("Type user name here")) }}<button class="btn">{{ _("Add") }}</button>
 {% endmacro %}
 
+{% macro edit_member(form, title=True) %}
+    <fieldset>
+        {% if title %}<legend>{{ _("Edit this member") }}</legend>{% endif %}
+    {% include "display_errors.html" %}
+    {{ form.hidden_tag() }}
+    {{ input(form.name) }}
+    {{ input(form.weight) }}
+    </fieldset>
+    <div class="actions">
+        {{ form.submit(class="btn btn-primary") }}
+    </div>
+{% endmacro %}
+
+
 {% macro invites(form) %}
     {{ form.hidden_tag() }}
     {{ input(form.emails) }}
diff --git a/sources/budget/templates/invitation_mail.en b/sources/budget/templates/invitation_mail.en
index 4f5bbf0..03f5141 100644
--- a/sources/budget/templates/invitation_mail.en
+++ b/sources/budget/templates/invitation_mail.en
@@ -1,10 +1,10 @@
-Hi, 
+Hi,
 
 Someone using the email address {{ g.project.contact_email }} invited you to share your expenses for "{{ g.project.name }}".
 
 It's as simple as saying what did you paid for, for who, and how much did it cost you, we are caring about the rest.
 
-You can access it here: {{ config['SITE_URL'] }}{{ url_for(".list_bills") }}, the private code is "{{ g.project.password }}".
+You can access it here: {{ config['SITE_URL'] }}{{ url_for(".list_bills") }} and the private code is "{{ g.project.password }}".
 
 Enjoy,
 Some weird guys (with beards)
diff --git a/sources/budget/templates/invitation_mail.fr b/sources/budget/templates/invitation_mail.fr
index a46f0a0..53698dd 100644
--- a/sources/budget/templates/invitation_mail.fr
+++ b/sources/budget/templates/invitation_mail.fr
@@ -4,6 +4,6 @@ Quelqu'un avec l'addresse email "{{ g.project.contact_email }}" vous à invité
 
 C'est aussi simple que de dire qui à payé pour quoi, pour qui, et combien celà à coûté, on s'occuppe du reste.
 
-Vous pouvez accéder à la page ici: {{ config['SITE_URL'] }}{{ url_for(".list_bills") }}, le code est "{{ g.project.password }}".
+Vous pouvez accéder à la page ici: {{ config['SITE_URL'] }}{{ url_for(".list_bills") }} et le code est "{{ g.project.password }}".
 
 Have fun,
diff --git a/sources/budget/templates/list_bills.html b/sources/budget/templates/list_bills.html
index f9d372a..f081334 100644
--- a/sources/budget/templates/list_bills.html
+++ b/sources/budget/templates/list_bills.html
@@ -13,9 +13,13 @@
 
     {% if add_bill %} $('#new-bill').click(); {% endif %}
 
-    // ask for confirmation before removing an user
+    // Hide all members actions
     $('.action').each(function(){
         $(this).hide();
+    });
+
+    // ask for confirmation before removing an user
+    $('.action.delete').each(function(){
         var link = $(this).find('button');
         link.click(function(){
             if ($(this).hasClass("confirm")){
@@ -42,13 +46,13 @@
         });
         $("#bal-member-"+payer_id).addClass("payer_line");
     };
-    
+
     var unhighlight_owers = function(){
         $('[id^="bal-member-"]').removeClass("ower_line payer_line");
     };
-    
+
     $('#bill_table tbody tr').hover(highlight_owers, unhighlight_owers);
-    
+
 {% endblock %}
 
 {% block sidebar %}
@@ -63,11 +67,16 @@
     {% set balance = g.project.balance %}
     {% for member in g.project.members | sort(attribute='name') if member.activated or balance[member.id] != 0 %}
     <tr id="bal-member-{{ member.id }}" action={% if member.activated %}delete{% else %}reactivate{% endif %}>
-        <td class="balance-name">{{ member.name }}</td>
+        <td class="balance-name">{{ member.name }}
+            <span class="light{% if not g.project.uses_weights %} extra-info{% endif %}">(x{{ member.weight|minimal_round(1) }})</span>
+        </td>
         {% if member.activated %}
         <td>
             <form class="action delete" action="{{ url_for(".remove_member", member_id=member.id) }}" method="POST">
-                <button type="submit">{{ _("delete") }}</button></form></td>
+                <button type="submit">{{ _("delete") }}</button></form>
+            <form class="action edit" action="{{ url_for(".edit_member", member_id=member.id) }}" method="GET">
+                <button type="submit">{{ _("edit") }}</button></form>
+        </td>
         {% else %}
         <td>
             <form class="action reactivate" action="{{ url_for(".reactivate", member_id=member.id) }}" method="POST">
diff --git a/sources/budget/templates/password_reminder.en b/sources/budget/templates/password_reminder.en
index fc24a6f..31210aa 100644
--- a/sources/budget/templates/password_reminder.en
+++ b/sources/budget/templates/password_reminder.en
@@ -1,4 +1,4 @@
-Hi, 
+Hi,
 
 You requested to be reminded about your password for "{{ project.name }}".
 
diff --git a/sources/budget/templates/reminder_mail.en b/sources/budget/templates/reminder_mail.en
index b2e3a65..fe57be2 100644
--- a/sources/budget/templates/reminder_mail.en
+++ b/sources/budget/templates/reminder_mail.en
@@ -1,4 +1,4 @@
-Hi, 
+Hi,
 
 You have just (or someone else using your email address) created the project "{{ g.project.name }}" to share your expenses.
 
diff --git a/sources/budget/templates/send_invites.html b/sources/budget/templates/send_invites.html
index 9ddded1..7b3bdc5 100644
--- a/sources/budget/templates/send_invites.html
+++ b/sources/budget/templates/send_invites.html
@@ -9,7 +9,7 @@
 {% endblock %}
 {% block content %}
 <h2>{{ _("Invite people to join this project") }}</h2>
-<p>{{ _("Specify a (comma separated) list of email adresses you want to notify about the 
+<p>{{ _("Specify a (comma separated) list of email adresses you want to notify about the
 creation of this budget management project and we will send them an email for you.") }}</p>
 <p>{{ _("If you prefer, you can") }} <a href="{{ url_for(".list_bills") }}">{{ _("skip this step") }}</a> {{ _("and notify them yourself") }}</p>
 
diff --git a/sources/budget/tests.py b/sources/budget/tests.py
index 0f7c2a2..82465f9 100644
--- a/sources/budget/tests.py
+++ b/sources/budget/tests.py
@@ -5,9 +5,12 @@ except ImportError:
     import unittest  # NOQA
 
 import base64
+import os
 import json
 from collections import defaultdict
 
+os.environ['FLASK_SETTINGS_MODULE'] = 'default_settings'
+
 from flask import session
 
 import run
@@ -413,6 +416,52 @@ class BudgetTestCase(TestCase):
         bill = models.Bill.query.filter(models.Bill.date == '2011-08-01')[0]
         self.assertEqual(bill.amount, 25.02)
 
+    def test_weighted_balance(self):
+        self.post_project("raclette")
+
+        # add two persons
+        self.app.post("/raclette/members/add", data={'name': 'alexis'})
+        self.app.post("/raclette/members/add", data={'name': 'freddy familly', 'weight': 4})
+
+        members_ids = [m.id for m in
+                       models.Project.query.get("raclette").members]
+
+        # test balance
+        self.app.post("/raclette/add", data={
+            'date': '2011-08-10',
+            'what': u'fromage à raclette',
+            'payer': members_ids[0],
+            'payed_for': members_ids,
+            'amount': '10',
+        })
+
+        self.app.post("/raclette/add", data={
+            'date': '2011-08-10',
+            'what': u'pommes de terre',
+            'payer': members_ids[1],
+            'payed_for': members_ids,
+            'amount': '10',
+        })
+
+        balance = models.Project.query.get("raclette").balance
+        self.assertEqual(set(balance.values()), set([6, -6]))
+
+    def test_weighted_members_list(self):
+        self.post_project("raclette")
+
+        # add two persons
+        self.app.post("/raclette/members/add", data={'name': 'alexis'})
+        self.app.post("/raclette/members/add", data={'name': 'tata', 'weight': 1})
+
+        resp =  self.app.get("/raclette/")
+        self.assertIn('extra-info', resp.data)
+
+        self.app.post("/raclette/members/add", data={'name': 'freddy familly', 'weight': 4})
+
+        resp =  self.app.get("/raclette/")
+        self.assertNotIn('extra-info', resp.data)
+
+
     def test_rounding(self):
         self.post_project("raclette")
 
@@ -532,7 +581,7 @@ class BudgetTestCase(TestCase):
         for m, a in members.items():
             self.assertEqual(a, balance[m.id])
         return
-        
+
 
 
 class APITestCase(TestCase):
@@ -550,9 +599,10 @@ class APITestCase(TestCase):
             'contact_email': contact
         })
 
-    def api_add_member(self, project, name):
+    def api_add_member(self, project, name, weight=1):
         self.app.post("/api/projects/%s/members" % project,
-                data={"name": name}, headers=self.get_auth(project))
+                      data={"name": name, "weight": weight},
+                      headers=self.get_auth(project))
 
     def get_auth(self, username, password=None):
         password = password or username
@@ -759,8 +809,8 @@ class APITestCase(TestCase):
             "what": "fromage",
             "payer_id": 1,
             "owers": [
-                {"activated": True, "id": 1, "name": "alexis"},
-                {"activated": True, "id": 2, "name": "fred"}],
+                {"activated": True, "id": 1, "name": "alexis", "weight": 1},
+                {"activated": True, "id": 2, "name": "fred", "weight": 1}],
             "amount": 25.0,
             "date": "2011-08-10",
             "id": 1}
@@ -802,8 +852,8 @@ class APITestCase(TestCase):
             "what": "beer",
             "payer_id": 2,
             "owers": [
-                {"activated": True, "id": 1, "name": "alexis"},
-                {"activated": True, "id": 2, "name": "fred"}],
+                {"activated": True, "id": 1, "name": "alexis", "weight": 1},
+                {"activated": True, "id": 2, "name": "fred", "weight": 1}],
             "amount": 25.0,
             "date": "2011-09-10",
             "id": 1}
@@ -820,6 +870,80 @@ class APITestCase(TestCase):
                 headers=self.get_auth("raclette"))
         self.assertStatus(404, req)
 
+    def test_weighted_bills(self):
+        # create a project
+        self.api_create("raclette")
+
+        # add members
+        self.api_add_member("raclette", "alexis")
+        self.api_add_member("raclette", "freddy familly", 4)
+        self.api_add_member("raclette", "arnaud")
+
+        # add a bill
+        req = self.app.post("/api/projects/raclette/bills", data={
+            'date': '2011-08-10',
+            'what': "fromage",
+            'payer': "1",
+            'payed_for': ["1", "2"],
+            'amount': '25',
+            }, headers=self.get_auth("raclette"))
+
+        # get this bill details
+        req = self.app.get("/api/projects/raclette/bills/1",
+                headers=self.get_auth("raclette"))
+
+        # compare with the added info
+        self.assertStatus(200, req)
+        expected = {
+            "what": "fromage",
+            "payer_id": 1,
+            "owers": [
+                {"activated": True, "id": 1, "name": "alexis", "weight": 1},
+                {"activated": True, "id": 2, "name": "freddy familly", "weight": 4}],
+            "amount": 25.0,
+            "date": "2011-08-10",
+            "id": 1}
+        self.assertDictEqual(expected, json.loads(req.data))
+
+        # getting it should return a 404
+        req = self.app.get("/api/projects/raclette",
+                headers=self.get_auth("raclette"))
+
+        expected = {
+            "active_members": [
+                {"activated": True, "id": 1, "name": "alexis", "weight": 1.0},
+                {"activated": True, "id": 2, "name": "freddy familly", "weight": 4.0},
+                {"activated": True, "id": 3, "name": "arnaud", "weight": 1.0}
+            ],
+            "balance": {"1": 20.0, "2": -20.0, "3": 0},
+            "contact_email": "raclette@notmyidea.org",
+            "id": "raclette",
+
+            "members": [
+                {"activated": True, "id": 1, "name": "alexis", "weight": 1.0},
+                {"activated": True, "id": 2, "name": "freddy familly", "weight": 4.0},
+                {"activated": True, "id": 3, "name": "arnaud", "weight": 1.0}
+            ],
+            "name": "raclette",
+            "password": "raclette"}
+
+        self.assertStatus(200, req)
+        self.assertEqual(expected, json.loads(req.data))
+
+class ServerTestCase(APITestCase):
+    def setUp(self):
+        run.configure()
+        super(ServerTestCase, self).setUp()
+
+    def test_unprefixed(self):
+        req = self.app.get("/foo/")
+        self.assertStatus(303, req)
+
+    def test_prefixed(self):
+        run.app.config['APPLICATION_ROOT'] = '/foo'
+        req = self.app.get("/foo/")
+        self.assertStatus(200, req)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/sources/budget/translations/fr/LC_MESSAGES/messages.mo b/sources/budget/translations/fr/LC_MESSAGES/messages.mo
index 59e6262..558d835 100644
Binary files a/sources/budget/translations/fr/LC_MESSAGES/messages.mo and b/sources/budget/translations/fr/LC_MESSAGES/messages.mo differ
diff --git a/sources/budget/translations/fr/LC_MESSAGES/messages.po b/sources/budget/translations/fr/LC_MESSAGES/messages.po
index 776e6e2..d915cb3 100644
--- a/sources/budget/translations/fr/LC_MESSAGES/messages.po
+++ b/sources/budget/translations/fr/LC_MESSAGES/messages.po
@@ -105,6 +105,10 @@ msgstr "Le montant d'une facture ne peut pas être nul."
 msgid "Name"
 msgstr "Nom"
 
+#: forms.py:155
+msgid "Weight"
+msgstr "Poids"
+
 #: forms.py:155 templates/forms.html:95
 msgid "Add"
 msgstr "Ajouter"
@@ -497,4 +501,3 @@ msgstr "Qui doit payer ?"
 #: templates/settle_bills.html:31
 msgid "To whom?"
 msgstr "Pour qui ?"
-
diff --git a/sources/budget/utils.py b/sources/budget/utils.py
index 9d63fc2..c849af0 100644
--- a/sources/budget/utils.py
+++ b/sources/budget/utils.py
@@ -1,6 +1,7 @@
 import re
 import inspect
 
+from jinja2 import filters
 from flask import redirect
 from werkzeug.routing import HTTPException, RoutingException
 
@@ -34,23 +35,25 @@ class Redirect303(HTTPException, RoutingException):
         return redirect(self.new_url, 303)
 
 
-class ReverseProxied(object):
+class PrefixedWSGI(object):
     '''
     Wrap the application in this middleware and configure the
     front-end server to add these headers, to let you quietly bind
     this to a URL other than / and to an HTTP scheme that is
     different than what is used locally.
 
+    It relies on "APPLICATION_ROOT" app setting.
+
     Inspired from http://flask.pocoo.org/snippets/35/
 
     :param app: the WSGI application
     '''
-    def __init__(self, app, prefix):
+    def __init__(self, app):
         self.app = app
-        self.prefix = prefix
+        self.wsgi_app = app.wsgi_app
 
     def __call__(self, environ, start_response):
-        script_name = self.prefix
+        script_name = self.app.config['APPLICATION_ROOT']
         if script_name:
             environ['SCRIPT_NAME'] = script_name
             path_info = environ['PATH_INFO']
@@ -60,4 +63,17 @@ class ReverseProxied(object):
         scheme = environ.get('HTTP_X_SCHEME', '')
         if scheme:
             environ['wsgi.url_scheme'] = scheme
-        return self.app(environ, start_response)
+        return self.wsgi_app(environ, start_response)
+
+
+def minimal_round(*args, **kw):
+    """ Jinja2 filter: rounds, but display only non-zero decimals
+
+    from http://stackoverflow.com/questions/28458524/
+    """
+    # Use the original round filter, to deal with the extra arguments
+    res = filters.do_round(*args, **kw)
+    # Test if the result is equivalent to an integer and
+    # return depending on it
+    ires = int(res)
+    return (res if res != ires else ires)
diff --git a/sources/budget/web.py b/sources/budget/web.py
index 77de026..63fbe4d 100644
--- a/sources/budget/web.py
+++ b/sources/budget/web.py
@@ -322,6 +322,24 @@ def remove_member(member_id):
     return redirect(url_for(".list_bills"))
 
 
+@main.route("/<project_id>/members/<member_id>/edit",
+            methods=["POST", "GET"])
+def edit_member(member_id):
+    member = Person.query.get(member_id, g.project)
+    if not member:
+        raise werkzeug.exceptions.NotFound()
+    form = MemberForm(g.project, edit=True)
+
+    if request.method == 'POST' and form.validate():
+        form.save(g.project, member)
+        db.session.commit()
+        flash(_("User '%(name)s' has been edited", name=member.name))
+        return redirect(url_for(".list_bills"))
+
+    form.fill(member)
+    return render_template("edit_member.html", form=form, edit=True)
+
+
 @main.route("/<project_id>/add", methods=["GET", "POST"])
 def add_bill():
     form = get_billform_for(g.project)
diff --git a/sources/docs/_themes/pelican/static/pelican.css_t b/sources/docs/_themes/pelican/static/pelican.css_t
index 3cb2a3c..8d8a9b2 100644
--- a/sources/docs/_themes/pelican/static/pelican.css_t
+++ b/sources/docs/_themes/pelican/static/pelican.css_t
@@ -6,11 +6,11 @@
  *
  * :copyright: Copyright 2011 by Alexis Metaireau.
  */
- 
+
 @import url("basic.css");
- 
+
 /* -- page layout ----------------------------------------------------------- */
- 
+
 body {
     font-family: Arial, sans-serif;
     font-size: 100%;
@@ -32,17 +32,17 @@ div.bodywrapper {
 hr {
     border: 1px solid #B1B4B6;
 }
- 
+
 div.document {
 }
- 
+
 div.body {
     background-color: #ffffff;
     color: #3E4349;
     padding: 0 30px 30px 30px;
     font-size: 0.9em;
 }
- 
+
 div.footer {
     color: #555;
     width: 100%;
@@ -50,12 +50,12 @@ div.footer {
     text-align: center;
     font-size: 75%;
 }
- 
+
 div.footer a {
     color: #444;
     text-decoration: underline;
 }
- 
+
 div.related {
     background-color: #6BA81E;
     line-height: 32px;
@@ -63,11 +63,11 @@ div.related {
     text-shadow: 0px 1px 0 #444;
     font-size: 0.9em;
 }
- 
+
 div.related a {
     color: #E2F3CC;
 }
- 
+
 div.sphinxsidebar {
     font-size: 0.75em;
     line-height: 1.5em;
@@ -76,7 +76,7 @@ div.sphinxsidebar {
 div.sphinxsidebarwrapper{
     padding: 20px 0;
 }
- 
+
 div.sphinxsidebar h3,
 div.sphinxsidebar h4 {
     font-family: Arial, sans-serif;
@@ -92,30 +92,30 @@ div.sphinxsidebar h4 {
 div.sphinxsidebar h4{
     font-size: 1.1em;
 }
- 
+
 div.sphinxsidebar h3 a {
     color: #444;
 }
- 
- 
+
+
 div.sphinxsidebar p {
     color: #888;
     padding: 5px 20px;
 }
- 
+
 div.sphinxsidebar p.topless {
 }
- 
+
 div.sphinxsidebar ul {
     margin: 10px 20px;
     padding: 0;
     color: #000;
 }
- 
+
 div.sphinxsidebar a {
     color: #444;
 }
- 
+
 div.sphinxsidebar input {
     border: 1px solid #ccc;
     font-family: sans-serif;
@@ -125,19 +125,19 @@ div.sphinxsidebar input {
 div.sphinxsidebar input[type=text]{
     margin-left: 20px;
 }
- 
+
 /* -- body styles ----------------------------------------------------------- */
- 
+
 a {
     color: #005B81;
     text-decoration: none;
 }
- 
+
 a:hover {
     color: #E32E00;
     text-decoration: underline;
 }
- 
+
 div.body h1,
 div.body h2,
 div.body h3,
@@ -151,7 +151,7 @@ div.body h6 {
     padding: 5px 0 5px 10px;
     text-shadow: 0px 1px 0 white
 }
- 
+
 {% if theme_index_logo %}
 div.indexwrapper h1 {
     text-indent: -999999px;
@@ -159,10 +159,10 @@ div.indexwrapper h1 {
     height: {{ theme_index_logo_height }};
 }
 {% endif %}
-div.body h1 { 
-    border-top: 20px solid white; 
-    margin-top: 0; 
-    font-size: 250%; 
+div.body h1 {
+    border-top: 20px solid white;
+    margin-top: 0;
+    font-size: 250%;
     text-align: center;
 }
 
@@ -171,23 +171,23 @@ div.body h3 { font-size: 120%; background-color: #D8DEE3; }
 div.body h4 { font-size: 110%; background-color: #D8DEE3; }
 div.body h5 { font-size: 100%; background-color: #D8DEE3; }
 div.body h6 { font-size: 100%; background-color: #D8DEE3; }
- 
+
 a.headerlink {
     color: #c60f0f;
     font-size: 0.8em;
     padding: 0 4px 0 4px;
     text-decoration: none;
 }
- 
+
 a.headerlink:hover {
     background-color: #c60f0f;
     color: white;
 }
- 
+
 div.body p, div.body dd, div.body li {
     line-height: 1.5em;
 }
- 
+
 div.admonition p.admonition-title + p {
     display: inline;
 }
@@ -200,29 +200,29 @@ div.note {
     background-color: #eee;
     border: 1px solid #ccc;
 }
- 
+
 div.seealso {
     background-color: #ffc;
     border: 1px solid #ff6;
 }
- 
+
 div.topic {
     background-color: #eee;
 }
- 
+
 div.warning {
     background-color: #ffe4e4;
     border: 1px solid #f66;
 }
- 
+
 p.admonition-title {
     display: inline;
 }
- 
+
 p.admonition-title:after {
     content: ":";
 }
- 
+
 pre {
     padding: 10px;
     background-color: #111;
@@ -234,7 +234,7 @@ pre {
     -webkit-box-shadow: 1px 1px 1px #d8d8d8;
     -moz-box-shadow: 1px 1px 1px #d8d8d8;
 }
- 
+
 tt {
     background-color: #ecf0f3;
     color: #222;
diff --git a/sources/docs/api.rst b/sources/docs/api.rst
index 34edbdb..ce5df71 100644
--- a/sources/docs/api.rst
+++ b/sources/docs/api.rst
@@ -64,18 +64,18 @@ Getting information about the project::
 
     $ curl --basic -u demo:demo http://ihatemoney.notmyidea.org/api/projects/demo
     {
-        "name": "demonstration", 
-        "contact_email": "demo@notmyidea.org", 
-        "password": "demo", 
+        "name": "demonstration",
+        "contact_email": "demo@notmyidea.org",
+        "password": "demo",
         "id": "demo",
-        "active_members": [{"activated": true, "id": 31, "name": "Arnaud"}, 
-                            {"activated": true, "id": 32, "name": "Alexis"}, 
-                            {"activated": true, "id": 33, "name": "Olivier"}, 
-                            {"activated": true, "id": 34, "name": "Fred"}], 
-        "members": [{"activated": true, "id": 31, "name": "Arnaud"}, 
-                    {"activated": true, "id": 32, "name": "Alexis"}, 
-                    {"activated": true, "id": 33, "name": "Olivier"}, 
-                    {"activated": true, "id": 34, "name": "Fred"}], 
+        "active_members": [{"activated": true, "id": 31, "name": "Arnaud"},
+                            {"activated": true, "id": 32, "name": "Alexis"},
+                            {"activated": true, "id": 33, "name": "Olivier"},
+                            {"activated": true, "id": 34, "name": "Fred"}],
+        "members": [{"activated": true, "id": 31, "name": "Arnaud"},
+                    {"activated": true, "id": 32, "name": "Alexis"},
+                    {"activated": true, "id": 33, "name": "Olivier"},
+                    {"activated": true, "id": 34, "name": "Fred"}],
     }
 
 
@@ -101,15 +101,15 @@ Members
 You can get all the members with a `GET` on `/api/projects/<id>/members`::
 
     $ curl --basic -u demo:demo http://ihatemoney.notmyidea.org/api/projects/demo/members\
-    [{"activated": true, "id": 31, "name": "Arnaud"}, 
-     {"activated": true, "id": 32, "name": "Alexis"}, 
+    [{"activated": true, "id": 31, "name": "Arnaud"},
+     {"activated": true, "id": 32, "name": "Alexis"},
      {"activated": true, "id": 33, "name": "Olivier"},
      {"activated": true, "id": 34, "name": "Fred"}]
 
 Add a member with a `POST` request on `/api/projects/<id>/members`::
 
     $ curl --basic -u demo:demo -X POST\
-    http://ihatemoney.notmyidea.org/api/projects/demo/members -d 'name=tatayoyo' 
+    http://ihatemoney.notmyidea.org/api/projects/demo/members -d 'name=tatayoyo'
     35
 
 You can also `PUT` a new version of a member (changing its name)::
@@ -122,7 +122,7 @@ You can also `PUT` a new version of a member (changing its name)::
 Delete a member with a `DELETE` request on `/api/projects/<id>/members/<member-id>`::
 
     $ curl --basic -u demo:demo -X DELETE\
-    http://ihatemoney.notmyidea.org/api/projects/demo/members/35 
+    http://ihatemoney.notmyidea.org/api/projects/demo/members/35
     "OK
 
 Bills