Since Jimmy Wales created Wikipedia, the free encyclopedia anyone can edit, six years ago, a bunch of "wikis" have sprung up.
Mental_floss has the scoop of the various wikis that are out there. For example:
Wikiality, “the truthiness encyclopedia” was launched by Comedy Central’s Stephen Colbert in 2006 shortly after he was banned from Wikipedia for encouraging vandalism.
Oh and Jimbo, while I agree there is some bias in some articles, I think overall Wikipedia serves as a good source for general information on a subject. If you want to look something up quickly it is great and for the most part reliable.
I'm not saying you should write a research paper using it as your main source though.
You would be a whole lot better off with an encyclopedia.
Wikipedia is just not a good source for information.