Another post mentions it, but Confluence may be a good fit. It is a Wiki, but geared towards the needs of an enterprise. Compared to other wikis, Confluence has better permission control and has better facilities for organizing articles. We have deployed several Conflence instances for clients, and all are happy.
Slashdot videos: Now with more Slashdot!
We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).