Wikis Described in Plain English | Common Craft - Social Design for the Web: "Wikis Described in Plain English"
A useful page which describes the what, why and when of wikis. As an aside, I always find it interesting that one of the advantage of wikis is that no HTML is needed for their creation... but there are a whole load of punctuation and stylistic bits o' code that you need to know if you don't want your contribution to look like an amateurish, numpty kinda affair. Will the community behind the wiki be sympathetic to your L plate blunderings? Will you be shot down for lack of academic rigour? Will you have all your hard work wiped in an instant when someone decides to grafitti it? What's really *your* work at all?
Anyhoo... enough blathering... if you want to get your head around wiki basics, this is the page for you!