Drupal Books

Book: 

Leveraging Drupal: Getting Your Site Done Right (Wrox Programmer to Programmer)

This upcoming book provides an introduction to Drupal, but also shows how to make the most of Drupal (leverage it) as Drupal goes from 5.x to 6.x to 7.x. The fast upgrade cycle is one of the things which can often be a problem for Drupal users. Victor's advice on handling that upgrade cycle will provide valuable insight into managing change in the fast-paced world of Drupal.