In case anyone's still paying attention, here are the threads I've found about books (other than songbooks), in date order, oldest first:

BS: The saddest read of all
Best book you ever read.
Worst book
Best Book Pt 2
books - ONE masterpiece.
BS: What have you been caught reading ?
BS: What do you read ?
BS: Current reading list - any good books?
BS: Movies they should make
BS: Your Favorite Authors
BS: Books online
BS: What Constitutes Good Writing?
Books That Most Influenced You
BS: A different kind of 'GREAT BOOK' thread.
Dangerous Books That Lead You Astray
BS: Best recorded books
Brits 21 Favourite Books -- Yours?
What Books Do You Reread?
BS: What books would you NOT reread?