This video was posted over at Kairos, but I think I've seen it before. It does a great job of explaining wikis to beginners:
My name is Jim Brown. I'm a Ph.D. Candidate in English at the University of Texas, specializing in Digital Literacies and Literatures. I maintain four blogs, and you can see all of my blog writings by viewing this RSS feed. The name of this blog is explained in this post from January 2008.

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