Document repositories in an online classroom

This is the kind of thing I keep talking and thinking about:

Claroline (ClassRoom online) is a collaborative learning environment that allows teachers or educational institutions to create and administer courses through the Web. The system provides group management, forums, document repositories, a calendar, chat, assignment areas, links, and user profile administration in a single, highly integrated package. It has been translated into 28 languages.

Emphasis mine. By the sounds of it, version control could really make this particular project into a killer app. I'm sure if you sifted through freshmeat, opensourceCMS, the CMS matrix and OngETC long enough, you'd find something that matches the criteria.