Anybody else looking for a tutorial styled knowledgebase should also take a look at GARS:
http://www.thevbgeek.com/
I personally haven't used it, but I've seen a few forums that have it working and it seems to be a really sweet system. BTW, if anyone has some experience they'd like to share, I'd definitely be interested because I'm looking for a plugin that can seamlessly plug into the vBulletin system that would allow my users to create tutorials & a knowledgebase.
An example of this in action:
http://www.thevbgeek.com/forumdisplay.php?f=12