diff -r ebaad720f88b -r 526ebd3988b0 web/lib/django_extensions/db/models.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django_extensions/db/models.py	Wed Jan 20 12:37:40 2010 +0100
@@ -0,0 +1,31 @@
+"""
+Django Extensions abstract base model classes.
+"""
+
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+from django_extensions.db.fields import (ModificationDateTimeField,
+                                         CreationDateTimeField, AutoSlugField)
+
+class TimeStampedModel(models.Model):
+    """ TimeStampedModel
+    An abstract base class model that provides self-managed "created" and
+    "modified" fields.
+    """
+    created = CreationDateTimeField(_('created'))
+    modified = ModificationDateTimeField(_('modified'))
+
+    class Meta:
+        abstract = True
+
+class TitleSlugDescriptionModel(models.Model):
+    """ TitleSlugDescriptionModel
+    An abstract base class model that provides title and description fields
+    and a self-managed "slug" field that populates from the title.
+    """
+    title = models.CharField(_('title'), max_length=255)
+    slug = AutoSlugField(_('slug'), populate_from='title')
+    description = models.TextField(_('description'), blank=True, null=True)
+
+    class Meta:
+        abstract = True