Elgg: the Learning Landscape 0.8

Elgg: the Learning Landscape is a community building platform written in PHP for MySQL and Apache.
It gives you the tools to create active and vibrant learning communities, featuring Weblogging, podcasting, social networking, file storage, tag searching, customised user themes, gettext multi-language support, and more.
Users can control exactly who has access to each bit of their profile, each blog post, file, etc., and then search using tags to find other resources and people related to the same topic.
Although originally designed for education, it has a broad range of uses in a variety of different settings.
Enhancements:
- Generalised comments
- Bugfixes, efficiency improvements