I'm looking to move away from our current help system solution - where we use clunky (won't name names) software to generate html/xml files of content/indexes that we then upload. It then adds basic searching. It is a beast to update, and the JS that powers it weighs in at nearly 2 megs.
I've been looking at http://68kb.com/. Has anyone used it? Does anyone have other, similar software to recommend? php based/mysql database is what I'm looking for, ideally.
Mediawiki is the best choice if you don't need to do funny stuff like setting up closed groups.
But like jacuesm said, the trac wiki is also nice but only if you intend to use the other trac capabilities IMO.