If you're aware of a CMS that uses an ORM (either their own or one of the well-known ones), please list the CMS here with the name of the ORM it uses.
If you know that the CMS you use DOESN'T use ORM, please also say so.
I know that neither Drupal nor Wordpress use ORM. Drupal 6 has it's own database abstraction layer, which is switching to PDO with D7, but it's still not ORM. Both WP and Drupal are built procedurally, and presumably an application should be built on an object oriented paradigm to take advantage of ORM.