I can come up with all sorts of way to use Library Thing in the classroom or the library. It could become a wonderful source of student book reviews and recommendations. I've learned from teaching my blogging class that kids are much more eager to put fingers to keyboard than pencil to paper.
It's also a new twist on that old chestnut "The Book Report". It's a much more natural activity to follow up a class read with than making a diorama or a poster about the book. I've read thousands of books in my lifetime and never once have I ever had the desire to mark the end of a great book by creating a diorama.
Right now my district doesn't offer e-mail addresses to our students and that's the one obstacle I've been coming up against while teaching blogging. Everything Web 2.0 requires an e-mail address and that's yet another thing our kids don't have. I know they are standard in upper and middle class schools where children acquire their own web page at birth but not at Title I schools. We created the blogs by attaching them to an e-mail address I created on my own personal account. That worked till we started making Avatars. Avatars, we discovered required separate e-mail addresses. I now own about 20 different yahoo e-mail addresses! Where there is a will there is a way.
The district has come a long way toward opening up the web to the students, perhaps personal e-mail addresses are not far behind. One can only hope.