Paul Di Filippo turns out a delightful wiki sendup in "Wikiworld", his contribution to the short story anthology "Fast Forward 1: Future Fiction from the Cutting Edge".
The print book isn't out yet, but his story is. And it's for everyone who has ever been part of a wiki, proposed changes to a national referendum, or become a local jimmywhale.
http://www.pyrsf.com/chapters/WikiWorld.htm
http://www.amazon.com/Fast-Forward-Future-Fiction-Cutting/dp/1591024862
++SJ