A web site that supports community editing. For example, Wikipedia at
http://en.wikipedia.org is a whole online encyclopedia that anyone can edit. A few other people and I are trying to get a poker one going at
http://poker.wikicities.com so that every time questions like this come up, we can point people to it rather than sending them to search 100's of threads. (The search here is really hard to use.)
It's fun, try it -- and don't worry about messing things up permanently, you can't.