I find wikis very interesting. I can spend hours on wikipedia. Everything is there. From a simple definition to the explanation of your favorite song. I see the pros and the cons of using wikis. The biggest con of course is that anyone can edit the wiki and may include incorrect information. I think if you are really worried about this, adding a login/password feature to your wiki is the way to go.
I added my Blog to the SJLibrary Learning 2.0 Sandbox and added to the Favorite Animals page. Wikis definitely are a way to provide an infinite amount of current info for millions of people with diverse interests. This info age is totally amazing.