Drupal7 introduces a lot of exciting and important innovations. As 1% of the biggest sites are now powered by Drupal, Drupal is at a stage it can take a lead at Internet technologies. Stuff like RDF needs a bootstrap from a major player in order to catch traction, and Drupal is taking a bold step here (and not for the first time). Other features, with less visibility to the non Drupal world, have quite a lot of significance as well.

The adoption of a generic data store allows support of the rather new noSQL movement.