Posted by btopro on July 28, 2008 at 7:56pm
This is just a reposting of Amazon's post over on Drupal Marketing but I thought it would be particularly interesting to those trying to sell administration or management on using Drupal over other platforms.
http://groups.drupal.org/node/13505
While it doesn't say Drupal is the most popular / biggest / most talked about CMS platform it lays out lots of graphs and statistics that prove there are three big ones: Joomla, Drupal, and WordPress. This at the very least can narrow your decisions down to those three when picking a platform to standardize on (or what you should be playing with bc of stability of the platforms).
Direct link to the article is here: http://www.waterandstone.com/downloads/2008OpenSourceCMSMarketSurvey.pdf