BuiltWith Technology recently published an overview of CMS Usage Statistics that shows the CMS distribution in the top million, top 100,000, and top 10,000 sites. (They define the top million sites as the web’s most visited sites in descending order).
The trend was very interesting when you look for Expression Engine, which typically is our CMS of choice. In the top million sites, Expression Engine ranks tenth. In the top 100,000 sites, EE is fifth, and in the top 10,000, EE is fourth. We often get asked by our larger clients and prospects about the size of the Expression Engine user base because what they mostly hear about is WordPress, Joomla, and Drupal. What these stats show is that even though EE may not have spread as prolifically as the open source alternatives, it has a strong presence in well-trafficked sites.