System admin collaberation/documentation tools?

So I'm part of a group of university students who administer a set of linux servers for the Carleton Computer Science society.  We're starting to get our act together, getting the servers tweaked nicely, and we're looking for a good way to keep track of things we do on the servers.  Something that would allow us to keep a rough track of changes made to the servers, notes on trick administration tasks, and other stuff like that.  I was thinking of something like tikiwiki: the main admin is leaning towards bugzilla.  Neither solution seems quite optimal though...

Any suggestions?