Rocket Theme makes an amazing product.
The gantry framework is amazing and unique at the same time. A user can purchase themes for joomla or wordpress and customize them on an amazing scale. The themes are all based on the 960 grid system. A user can also make a theme for gantry that can be easily modified later on without going through alot of coding. Gantry is the best framework for wordpress to date and one of the best theme frameworks for joomla. The only thing I can think of is that Drupal needs Gantry.
By Dante