DC:Making sense of Free and Open Source Content Management Systems

Drupal Books: Drupal Handbook http://drupal.org/handbooks

Four main books on Amazon: http://amazon.com/s/ref=nb_ss_gw/102-0684335-8724166?url=search-alias%3Daps&field-keywords=drupal&Go.x=0&Go.y=0&Go=Go

For Techies/Developers: http://www.amazon.com/Pro-Drupal-Development-John-VanDyk/dp/1590597559/ref=pd_bbs_sr_1/103-8326951-8964653?ie=UTF8&s=books&qid=1175961049&sr=8-1

For people just building websites: http://www.amazon.com/Drupal-Creating-Portals-Community-Websites/dp/1904811809/ref=pd_bbs_sr_2/103-8326951-8964653?ie=UTF8&s=books&qid=1175961049&sr=8-2

Elements of User Design http://www.jjg.net/elements/