Here is an article discussing the improvements of both Drupal and Wordpress. Originally, I thought it would be more of a "battle" because of the title. However, it is an accurate run down of "what's new" on the two platforms.

Drupal is an open-source, PHP-based content management system. Drupal offers web sites a broad range of features and multi-user administration, community discussion and news aggregation. There are many other features made possible through contributions from the Drupal community.