The Chronicle of Higher Education's ProfHacker blog has a post in which he discusses how he has used social media technologies - specifically Twitter, a wiki, Zotero and Google Wave with his students in his classes. He has some interesting thoughts on what works well and how some problems might be fixed in the future. He also invites comments by posing questions for his readers:
What experiences have you had using social media in the classroom?
What are your favorite (social media) tools? Which would you never, ever use again?