One college use of wikis: teaching composition with Wikipedia. An English prof describes his pedagogy, based on audience awareness, social learning, reflective writing, and more.
Note the post-class direction of the strategy:
Composition assignments in Wikipedia frame writing as a collaborative practice hosted within a network. This arrangement seems much more predictive of the environment our students will find themselves writing in after they leave the composition classroom, both in later college courses (as they collaborate across networks with fellow students in coursework) or in the workplace (as they collaborate with co-workers to prepare reports, proposals, or Web pages).
(via Laura Blankenship)