Rucker's book on The Sopranos is so far the only book I've seen out there about the show, so I guess we have to live with it until they come out with something else. I also picked up the book called The Psychology of the Sopranos, but it's more about the sessions between Melfi and Tony and less about the show as a whole. It's still good reading, though, especially if you have an interest in psychology (that was my minor in college).