I think you brought up a very interesting point in regard to versioning of work. It seems like wikis need to solve the problem of authenticity and organization which can be subclassifed under problems of attribution and versioning. How, for example, does one see what the most recent changes were to a wikipedia entry?

Wikipedia and the course wiki both have versioning and diff functionality, although I personally find both difficult to interpret.

http://en.wikipedia.org/w/index.php?title=Software_versioning&action=history http://ngw.cs.colorado.edu/bin/view/DSSF2008/A5YorkCilke?viewer=changes