Drupal is, quite frankly, a pain in the butt if you don’t know any php, and aren’t comfortable learning the architecture of a site. For most individuals who just want to blog, or have a small business website, I still think WordPress is king. It’s easy as hell to understand and it’s quite flexible. Nearly every site I’ve ever created I did with WordPress. I’m a mathematician, not a web developer.
But, for large websites needing lots of features or, in this case, for a large government, Drupal is well worth the learning curve. It can do pretty well anything you want it to do. It’s more secure than most CMS’s. And, it’s got a large community of developers backing it up.
WhiteHouse.gov’s switch is part of an effort on the part of the Obama Administration to make the white house a more interactive and “Web 2.0” friendly place. He is the first President to be addicted to his Blackberry after all.