One Book, One Twitter
Interesting concept from Wired - crowdsourcing a book that everyone reads and discusses in a gigantic twitter book club.
The winner was American Gods by Neil Gaiman, and the reading schedule and discussion began last week.
By following @1b1t2010 on twitter, and appending #1b1t to your tweets, you can participate in a chaotic global discussion, with Mr Gaiman himself chiming in to answer questions. I get the feeling it needs some kind of moderation to cut through the noise, but maybe the concept will evolve for the next book.