diff --git a/budget/models.py b/budget/models.py
index bf9ad92..efb5a3d 100644
--- a/budget/models.py
+++ b/budget/models.py
@@ -1,3 +1,5 @@
+from collections import defaultdict
+
 from datetime import datetime
 from flaskext.sqlalchemy import SQLAlchemy
 
@@ -12,6 +14,28 @@ class Project(db.Model):
     contact_email = db.Column(db.String)
     members = db.relationship("Person", backref="project")
 
+    @property
+    def active_members(self):
+        return [m for m in self.members if m.activated]
+
+    def get_balance(self):
+
+        balances, should_pay, should_receive = defaultdict(int), defaultdict(int), defaultdict(int)
+
+        # for each person
+        for person in self.members:
+            # get the list of bills he has to pay
+            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()
+
+        for person in self.members:
+            balances[person] = should_receive[person] - should_pay[person]
+
+        return balances
+
     def __repr__(self):
         return "<Project %s>" % self.name
 
@@ -22,7 +46,7 @@ class Person(db.Model):
     bills = db.relationship("Bill", backref="payer")
 
     name = db.Column(db.UnicodeText)
-    # activated = db.Column(db.Boolean, default=True)
+    activated = db.Column(db.Boolean, default=True)
 
     def __str__(self):
         return self.name
diff --git a/budget/templates/compute_bills.html b/budget/templates/compute_bills.html
index 8f286cf..4c6fd56 100644
--- a/budget/templates/compute_bills.html
+++ b/budget/templates/compute_bills.html
@@ -1,4 +1,9 @@
 {% extends "layout.html" %}
+
+{% block top_menu %}
+<a href="{{ url_for('list_bills', project_id=project.id) }}">Back to the list</a>
+{% endblock %}
+
 {% block content %}
 <h2>Computations</h2>
 
@@ -12,14 +17,14 @@
 </div>
 
 <div class="container span-6 last">
-    <a class="awesome large green button" onclick = "if (! confirm('Are you sure ?')) return false;" href="{{ url_for("reset_bills") }}">Mark this as payed / processed</a>
+    <a class="awesome large green button" onclick = "if (! confirm('Are you sure ?')) return false;" href="">Mark this as payed / processed</a>
 </div>
 
 <table>
     <thead><tr><th>Name</th><th>Balance</th></tr></thead>
     <tbody>
-{% for name, balance in balances.items() %}
-        <tr><td>{{ name }}</td><td>{{ balance }}</td></tr>
+{% for person, balance in balances.items() %}
+        <tr><td>{{ person.name }}</td><td>{{ balance }}</td></tr>
 {% endfor %}
     </tbody>
 </table>
diff --git a/budget/templates/list_bills.html b/budget/templates/list_bills.html
index a26dccc..48308fe 100644
--- a/budget/templates/list_bills.html
+++ b/budget/templates/list_bills.html
@@ -7,16 +7,22 @@
 {% endblock %}
 
 {% block content %}
-<div id="leftmenu" class="span-6">
+<div id="leftmenu" class="span-4">
     <ul>
-    {% for member in project.members %}
-        <li>{{ member.name }}</li>
+    {% set balance = project.get_balance() %}
+    {% for member in project.active_members %}
+    <li> {{ member.name }} {{ balance[member] }} <a href="{{ url_for("remove_member", project_id=project.id, member_id=member.id) }}">x</a></li>
     {% endfor %}
     </ul>
-    {% set form=member_form %}
-    {% include "member_form.html" %}
+    <form action="{{ url_for("add_member", project_id=project.id) }}" method="post">
+        {{ forms.add_member(member_form) }}
+    </form>
 </div>
-<div id="content" class="span-18 last">
+<div id="content" class="uniForm span-20 last">
+    <form id="add_bill" action="{{ url_for('add_bill', project_id=project.id) }}" method="post" style="width: 400px; display: none">
+        {{ forms.add_bill(bill_form) }}
+    </form>
+
     {% if bills.count() > 0 %}
     <table>
         <thead><tr><th>When ?</th><th>Who paid?</th><th>for what ?</th><th>Owers</th><th>How much ?</th><th>Actions</th></tr></thead>
diff --git a/budget/web.py b/budget/web.py
index 1afb8c1..c2909bc 100644
--- a/budget/web.py
+++ b/budget/web.py
@@ -1,3 +1,5 @@
+from collections import defaultdict
+
 from flask import (Flask, session, request, redirect, url_for, render_template, 
         flash)
 from flaskext.mail import Mail, Message
@@ -107,7 +109,10 @@ def list_bills(project):
     # FIXME filter to only get the bills for this particular project
     bills = Bill.query.order_by(Bill.id.asc())
     return render_template("list_bills.html", 
-            bills=bills, project=project, member_form=MemberForm(project))
+            bills=bills, project=project, 
+            member_form=MemberForm(project),
+            bill_form=get_billform_for(project)
+    )
 
 @app.route("/<string:project_id>/members/add", methods=["GET", "POST"])
 @requires_auth
@@ -121,10 +126,20 @@ def add_member(project):
             return redirect(url_for("list_bills", project_id=project.id))
     return render_template("add_member.html", form=form, project=project)
 
+@app.route("/<string:project_id>/members/<int:member_id>/delete", methods=["GET", "POST"])
+@requires_auth
+def remove_member(project, member_id):
+    person = Person.query.get_or_404(member_id)
+    if person.project == project:
+        person.activated = False
+        db.session.commit()
+        flash("%s has been removed" % person.name)
+    return redirect(url_for("list_bills", project_id=project.id))
+
 @app.route("/<string:project_id>/add", methods=["GET", "POST"])
 @requires_auth
 def add_bill(project):
-    form = get_billform_for(project.id)
+    form = get_billform_for(project)
     if request.method == 'POST':
         if form.validate():
             db.session.add(form.save())
@@ -140,24 +155,7 @@ def add_bill(project):
 @requires_auth
 def compute_bills(project):
     """Compute the sum each one have to pay to each other and display it"""
-    # FIXME make it work
-
-    balances, should_pay, should_receive = {}, {}, {}
-    # for each person, get the list of should_pay other have for him
-    for name, void in PAYER_CHOICES:
-        bills = Bill.query.join(BillOwer).filter(Bill.processed==False)\
-                .filter(BillOwer.name==name)
-        for bill in bills.all():
-            if name != bill.payer:
-                should_pay.setdefault(name, 0)
-                should_pay[name] += bill.pay_each()
-                should_receive.setdefault(bill.payer, 0)
-                should_receive[bill.payer] += bill.pay_each()
-
-    for name, void in PAYER_CHOICES:
-        balances[name] = should_receive.get(name, 0) - should_pay.get(name, 0)
-
-    return render_template("compute_bills.html", balances=balances, project=project)
+    return render_template("compute_bills.html", project=project)
 
 
 @app.route("/<string:project_id>/reset")