For those who haven't noticed yet, the latest in a expected long line of Drupal books for this year has been published: David Mercer's verbosely-named "Building Powerful and Robust Websites with Drupal 6". It is not a book for the experienced Drupaler; it's target market is people picking up Drupal, and the web for that matter, for the very first time.
Personally I think David has done a great job with it, but then I am biased; I was the tech reviewer for the book. :-) If you want an unbiased opinion, pick up a copy yourself and give it a read. Then you'll know how good it is. As an added bonus, 5% of all sales through Packt's web site are donated to the Drupal Association. Everybody wins!