The Drupal community has not only been a boundless source of information, but also a positive environment. This community is to be commended for creating a successful habitat for growing a top-quality application. Writing this book has involved a veritable army of editors, technical reviewers, and proofreaders. This book has benefi ted tremendously from their hard work. I would like to thank Douglas Patterson not only for being my editor, but for getting me involved with Drupal in the fi rst place. Thanks to Patricia Weir and Swapna V.Verlekar, who have worked tirelessly on the book. I owe a huge debt of gratitude to John Forsythe and Jason Flatt, whose meticulous reading and copious suggestions have had a profound infl uence on the fi nal state of this book. I'd also like to thank: Edward Peters, David Norman, and Sherif for their invaluable suggestions. Thanks also to the many individuals at Drupalcon 2008 who provided input and who took the time to chat with me about Drupal. Finally, thanks to Angie, Katherine, Claire, and Annabelle for putting up with a few late nights and some occasional whining.