Wikis are cool. You know how I know that? 'Cause Literacy already has one! Really! It's here: http://adult-literacy.wikispaces.com. We try to keep it updated, and ideally, it would be a wonderful resource for both tutors and students. However, I think we have trouble getting people to actually go there and contribute. I'm not sure what the solution to that issue is, because as it stands, right now there's very little collaboration going on, we just make sure to get events and announcements up there. Anyone have any ideas for this? I myself have used a lot of wikis, and have been forced to do some for library school. Different wiki editors/farms have good and bad qualities. Sometimes wikispaces really frustrates me, but you have to take that when you know it's designed for people like me who have no clue about HTML.
I like the idea in general, but having someone moderate is ideal. I'm amazed at Wikipedia, but also know how easy it is to get false (but sometimes really funny) information in there. So, to sum up: wiki = good, but only if you get people to participate!