The Washington Post talks about using blogs and wikis in the classroom:

Early e-mail lists, newsgroups and chat rooms were ephemeral, like a passing conversation, said Steve Jones, a communication professor at the University of Illinois at Chicago. Now computers and networks are fast enough that many people can share text, videos, sound and art and work on them together, he said, building a body of knowledge over time. Wikis, including interactive encyclopedia Wikipedia, have been around for several years but they're just on the cusp of becoming mainstream; as the technology improves, they're popping up in a few classrooms and offices, and people are finding all sorts of uses for them.

It's the plugged-in version of a long tradition in literature, said wiki user Matthew G. Kirschenbaum, an assistant professor of English at the University of Maryland. Hundreds of years ago people kept "commonplace books," in which they would write down poems, passages from books, and observations to share. Most people think of writing as solitary, he said -- "the lonely poet taking long walks in the woods, but there's another type of writing that's social and reactive."

...via elearningpost