Jacine Rodriguez of Gravitek Labs talks about the Skinr module, which is a module that allows a Drupal theme to define a set of reusable and modular CSS styles and makes them available through the user interface. The Skinr module was inspired by the Block Theme, but extended to be more flexible.

The Skinr module is the basis for Top Notch Themes' Fusion theme, which is demonstrated in some videos here. And since the recording of this podcast DrupalCon Paris, TNT has released a new website of Fusion-based themes at: http://fusiondrupalthemes.com