By now, most people have heard that whitehouse.gov has been migrated over to Drupal. Apparently, the administration has built a level of comfort with the platform with its experience using it for recovery.gov. While the Drupal community is doing high fives all around and equating this with being the most powerful CMS in the free world, I wouldn't go that far. I would say that Drupal is a very good choice for powering the kind of website that the Obama administration is trying to foster: content rich, news oriented, faceted, and populist.
Apparently, Slate Magazine's Chris Wilson wasn't so generous with his critique of the choice. I discovered the Slate article by reading Conor McNamara's excellent post