GoodReads (http://www.goodreads.com/) is good enough for me; it’s got reviews and book discussions going on in the corners, a fantastic trivia quiz, lovely integration with Facebook, and is really free top-to-bottom. It even has a half-decent interface! I’m calling quits on this goal; I’m no longer as much into web stuff as I was, and man, GR is doing a much better job than I could ever.