I wonder about the reason for an organization for switching from Drupal to WP: http://wpnyc.org/groups/job-board/forum/topic/need-a-wordpress-ui-developerdesigner-to-upgrade-nonprofits-website/
Not to say that I want to poke fun at Drupal – for me it’s just easier to set up websites using WP than Drupal as a front-end person. If I were to do a website with Drupal, I would need to collaborate with a developer (because Drupal has a higher learning curve) – but with WP I can do most things to create a website by myself (depending on a project scope).
If some people claim that Drupal has more features than WordPress (like integrating wiki and forums), why would some organizations want to switch from Drupal to WordPress? Is it because WP is more user friendly than Drupal or has certain things that Drupal doesn’t?