We are experimenting with the use of Aquaminds Notebooks for collaborative projects.

For an introduction to this tool, and some examples of its use, especially by the State of Maine in Education, see http://noteshare.net/NoteShare/Notebooks/AquaMindsinEducation/

The best introduction I've found so far is this video at iTunes U.
http://tinyurl.com/bzo7h7
This will cause iTunes to open to "Mac Learning Environments"
Look for "NoteShare_and_NoteShare Server_05_28_08".
It is probably in line 16.