Jon Udell highlights an issue that Dave Winer ran across in a WikiPedia page - from Dave's blog:

How is Wikipedia going to prevent from this from happening again? That's a serious issue. It's not the first time it's happened. This is why I've never been a strong advocate of Wikipedia.

When I spotted that in his blog, I followed the link, and couldn't see the problem - the page had been updated between the time Dave posted on it and my aggregator updated. Jon Udell has a lot more on the evolutionary nature of WikiPedia posts, and his screencast on the subject is perhaps the best way to understand how that works.

On a Wiki, information doesn't so much want to be free as it wants to be updated...