I do not pretend to know much about wikis on the Web, what they are there for or what you should really do with them. Of course, neither does eighty percent of the Web, so I do not feel so much out of the loop just yet. That is where a Firefox extension like Wikipedia Toolbar comes into play.
The Wikipedia extension makes editing of Wikipedia pages easier by adding a new toolbar to your browser and by providing new menu items in the context menu (right mouse key). You can read more details, have a look at it or jump right to the installation..
It might not make wikis any more interesting or teach you how to use it. It will though make editing them a heck of a lot easier.
Side Note: to get this extension to work in Firefox 2, you will need to use Mr Tech Local Install