IBM goes with Drupal

Drupal is a relative youngster compared to other content management systems (CMSs). However, we got the impression the framework was well written, robust, very extensible, and seemed to have a thriving development community that was generating a lot of adoption and support....

... Drupal is known for scalability, or ease of growing a Web site from a small set of users to an enterprise level. The framework also has the ability to 'throttle' areas of the site that could cause potential problems during heavy traffic situations.