Drupal is the premier open source content management system available. It is used for high profile sites such as TheOnion.com and has been deployed by organizations such as NASA. Utilizing Drupal, you can create your own personal blog, a community driven site like Slashdot, or any other content oriented web site you can imagine.
Pro Drupal Development is a book geared to professionals that need to deploy and customize Drupal. This book delves deep into the internals of the Drupal system and teaches the reader everything they will need to know to deploy a highly customized and optimized Drupal installation. Every web developer looking to deploy web sites quickly to their clients while still being able to harness the power of an excellent content management system needs this book.
From the reviews:
"This book investigates in detail the inner workings of Drupal. It teaches readers how to add new functionalities and features to their sites, and how to customize or improve existing ones. ... The structure of each chapter is clear and simple, with a summary at the end, some tips and notes in frames, many pictures and schemas and generally thorough explanations. ... this is a very interesting and well-written book. It is a must-read for anybody dealing with content management systems, especially Drupal." (O. Lecarme, ACM Computing Reviews, September, 2008)