Drupal Books

Aaron Winborn reviewed the book Cracking Drupal.

One choice paragraph:

I know that's a cliche, but when I first learned about Greg Knaddison's book (greggles in Drupal-land), I'd assumed it would be aimed primarily at Drupal contributed module developers. By the time I finished the excellent book about Drupal security, I realized it was an essential read for anyone connected with developing, theming, or maintaining a Drupal site.