JimboWiki is a project of mine. It's based on MediaWiki, which is the same software that runs Wikipedia and its sister sites. I originally brought it online so that I wouldn't have to spend so much time designing web pages. Instead, using the wiki, I am able to simply put in the content I want and let the wiki software take care of the formatting, searching, indexing, navigation, and asthetics. Of course, if you have something useful to contribute, simply create an account and edit/create away!
For more information about MediaWiki, including detailed instructions on how to use the wiki software to edit/create pages, hit the link in the bottom right.