Drupal has won the 2008 Overall CMS Award (Content Management System) from Packt Publishing. It has also won best CMS based on a PHP/MySQL platform. Joomla wins 2nd place (Joomla was the 2006 winner) for overall CMS, and Joomla also ties for second in a PHP/MySQL platform CMS.
Excerpt on Joomla:
Finishing in second place and receiving $3,000 was Joomla!, the youngest of the three finalists and a previous winner of the Overall Award. Judges were impressed with Joomlaâ€™s ease of installation and ability to get a website up-and-running in a short space of time. Particular praise was reserved for its sizeable and enthusiastic community, which has allowed the project to grow so quickly in such a short space of time.