There's been another kerfuffle in the library blogosphere lately about Wikipedia. (What do you mean, you hadn't noticed?)
This article from the Guardian started it with it's report that a College in Vermont has 'banned students from citing Wikipedia'. In fact, as you read on, you discover that they were not saying that students shouldn't use Wikipedia, but that while Wikipedia may be a useful source, it should not be regarded as authoritative, and so should not be cited.
I did like the alternative suggested, of getting all students to take an introductory course in scepticism.