For the record, I am considering a module like Facebook's core Wall that could be attached to Events, Groups and Profiles to allow collaboration. It would NOT evolve into the Forum and would be used for basic communication (it would use the Rich Text Editor so would allow for HTML/pics etc) but it would function almost exactly like FaceBook's wall... (the security rights would be configurable - eg. only your friends could write on your profile wall, your invited guests could write on your event wall, and your group members could write on your group wall etc..
I need to know if this would be useful or not...
At some point in the future a rating system could be built in.