Source: CD Freaks
Wiki's are definitely taking off in a big way. I just implemented one at work for our corporate intranet.
While you guys are evaluating it, you might want to have a look at TWiki.
I started off using MediaWiki then moved the company one over to TWiki as it has some very powerful features that MediaWiki does not (ie a page can be set to display the results of a search saved in it so when someone goes to the page they instantly just see the search results in the page so you could have a page called: Software Reviews and just set it to do a search of any page with the word review in it so when people clicked it they automatically saw the results without having to do the search themselves. This means one person can spend time perfecting the search query and everyone sees its results. Its also extremely easy to set Auth per page for multiple users, groups, etc).
Anyway, nice job on implementing one.
Good luck with it 