You all remember Digging Into WordPress. It was one of the first WordPress books I used as a textbook way back when. Now we have a new book from author Jeff Start (looks like no Coyier on this one): The Tao of WordPress (direct link to buy).
I’m not sure how much of a “developers” book this is compared to the last one, but the illustrations from this book look amazing!
Go check out and buy the book on wp-tao.com.