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From the announcement:
We are pleased to announce that Drupal has won the Best Open Source PHP CMS Category in the 2009 Open Source CMS Award. This category featured a very close contest between the top three, Drupal, WordPress, and Joomla! in which Drupal ended up as the overall choice for the judges and the public.
While Drupal and Joomla! have always consistently featured among the top three in this category, WordPress made its way into the top five for the first time. The fact that it was outranked by Drupal by a very slight margin indicates how popular it has become with users as well as developers over the past year.
Runners up this year were WordPress and Joomla! who each were granted $500 prizes.
Congratulations to Drupal and it's developers.