The book is Professional XNA Game Programming by Benjamin Nitschke (ISBN 0470126779).
This is the first book that will be released (May time) that covers XNA programming. Won't teach you how to program C#, but if you can do that and want to get a book that then teaches you how to do XNA then this is the very first one that will do just that. Written by the same guy who did Rocket Commander and XNA Racer (see YouTube video).