The Wiki Plugin generates a Usemod Wiki file that has the same look and feel as the Maven-generated website.
A Wiki is a web page that anyone can modify as wanted. The main interest of a Wiki is simplicity. One doesn't need to be a programmer, or even a webmaster, to write wiki files. The only things to keep in mind are the text formatting rules, that are used to edit the pages. This allows informations to be shared and updated at light's speed, while being a very entertaining experience. All you need is a web browser ! ;-)