PB WIKI

Yes, making a wiki is really as easy as making a peanut butter sandwich. Actually, it is probably easier since you don't have to wash dishes!

http://www.pbwiki.com

I have found this site to be pretty intuitive and easy to work with. I'm having a lot of fun figuring out how to create links and images on the wiki. The new editing interface and tools make it easy to add lively content to the wiki and the cut and paste code - like the one that put the image and url in the current post - makes it easy for those of us who don't know html.