Student Collaboration Tools

Question: Do you have any suggestions for software tools that can be used for student collaboration on projects?

The IT Guy says:
Web Collaborator is a web 2.0 service that permits users to collaborate on the project in a wiki space, keep a discussion forum to document progress, and also records a "history" of all activity to show exactly which student users have done what. JotSpot is an application Wiki which provides free wiki hosting for students or anyone else, offering up to 20 pages for five different users.

Writely is a "Web Word Processor" which students can use to collaborate on a shared document. Additional examples of read/write web solutions are available on ReadWriteWebTools.

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