I just upgraded wamber.net to Pinax. Pinax is a Django project intended to provide a starting point for websites.
The site is still mostly unconfigured and will likely be going through lots of changes in the very near future.
You can Sign up and Log in to try out the site.
At this stage, there is openid support, email verification, password management, site announcements, user-to-user messaging, friend invitation (both internal and external to the site), a basic twitter clone, interest groups (called tribes), projects with basic task and issue management, threaded discussions, wikis, blogging, bookmarks, contact import (from vCard, Google or Yahoo), photo management and a notification framework.