There was an interesting piece by Steve Kolowich in Inside Higher Ed today on wikis in higher ed. he concludes that unless wikis find a satisfactory way to attribute specific content to individual contributors they will not satisfy academic researchers, but they that have been more successful in teaching and administration.
I am not sure I agree that they have been more successful in teaching or administration. I have used them in the classroom (as a glorified annotated bibliography in a one credit information course) and in administration (as regular readers of this blog know the Olin Library's strategic plan is a wiki.) The major problem I have found it the lack of enthusiastic adoption by the group one wants to participate in building the wiki. I think this is because the barriers to entry -- logging in, and the WYSIWYG editing features -- are just a bit too high for casual users to manage, even those who have no problem with other web based technologies. That combined with a the lack of attractiveness of much of the content (I am shocked, shocked, to find that our library staff are not as excited about strategic planning as I am!) leads to a lack of uptake.