Nice start and a good reaction to the information overload of book recommendation threads :)

A few comments:

- Zooming on image covers seems pointless to me (is it just me?)

- I'd like to see some kind of indicator of usefulness/relevance of books (books 1 person recommended vs books that crop up in every single thread), whether you just open it up to upvoting and downvoting, pull in review data, or get more complex

- One step further, crowdsource book summaries - let a contributor submit 'cliff's notes' for a book rather than just a review.