Wikis

I have looked at a number of Wikis, and have found it interesting that all can post to them. It seems as if the "it takes a village" philosophy also applies to technology!! What I had trouble with is I was constantly wondering about the validity of the entries, and how "expert" the wiki-writers were. Where Wikis would be helpful is particularly in the book review area--I found interesting the opinions of others relating them (liked the BooksLoversWiki).