I'm ordering one of these right away. These folks really know their Drupal. Also I have found that O'Reilly books are really top notch. I'll post more about how good this book is soon. Update 3-26-09: I'm a huge fan. What a nice book.
I am only a few chapters in and it has already saved me a bunch of time and made some of my Drupal development go more smoothly. I recommend this book highly to folks wanting to implement Drupal websites. It doesn't really get into programming php but it does challenge you to do some thinking. Definitely not a light read. Full, chunky - meaty? It is organized around case studies (or projects) which outline which modules to use (and not to use.) Good job Lullabots!