According to the Water and Stone 2011 Open Source Content Management System Market Share Report, Drupal remains steady in the Big Three at third - with Joomla dropping and Wordpress taking the top spot.
There are acknowledged imperfections within the report and, while it hits the broad strokes and teases out some important information, there is something that doesn't really come out of that data: The types of websites that are built using the related Content Management Systems.
We here at Treehouse have found that when it comes to implementing large scale solutions like Energy.gov, Zagat.com and other sites in our portfolio, the Drupal framework has been invaluable in assuring customer satisfaction through it's flexibility and rapid development.
When a solid team works with the Drupal framework, you get great results.
While it's third for Water And Stone, Drupal remains #1 for our clients who require enterprise level solutions.