I'm currently toying about with MediaWiki so that we can eventually have an Encyclopedia JumpLeadia to act as a sort-of resource for all of the people, places and technology seem in the webcomic. I'm not overly sure of how many people will use it, but it'd be a great resource for me and the other writers.
The trouble is, I don't have an awful lot of experience with some of the more advanced MediaWiki editing features, so I'm having difficulty doing things like setting up templates for brief character info, etc. - the sort of thing you'd see at the top-right of a characters' entry on, say, Memory Alpha. If anyone fancies helping getting the Wiki going, you can find it here. It's a fairly fresh install so you can't currently do things like upload images and the like.