5 Reasons Why WordPress is the Taking Over the World
Wordpress has now been around for many years and has developed a long way since its first incarnation as a tool just for blogging. Of course it is still a powerful blogging tool, but other parts of the software have been enhanced so much that it is now the platform of choice for all manner of websites.
It has overtaken both Drupal and joomla as the most searched for CMS (graphic from Google Trends)
While it doesn’t necessarily correlate that it is therefore the most used CMS, it’s a reasonable assumption that more people are searching for it because more people are trying to do things with it.