We're using one, but it's fairly bare at the moment. I'm working on templates and fleshing out some of the content. Other folks are on board to help w/ content, as well.
I tried to do a wiki implementation for anime reviews and the such but i didn't quite like it. Too boring to look at. Have never personally looked at the one here.
so i and a friend are working on our own custom way of implementing such features
We _finally_ got a wiki running and being ramped up for release to the unwashed at work. Great way to provide and share info, though I'm not sure how well this 70+ bunch will do with that much freedom to change things. I'm looking at it as one of our first steps in the right direction, toward a trusting and open work environtment.