Listing of resources for discovery of responsive Drupal theme frameworks.
What is the best starter theme for responsive web design in Drupal?
Responsive Theming: How to Apply Responsive Design Techniques to a Drupal Theme
General responsive framework
HTML5_Boilerplate by Jeff Burnz (Drupal 7 only)
Terrain: 960 Fluid grid. Based on Hexagon. Drupal 6 currently.
Square Grid: lightweight resizable grid framework (Drupal 7 only).
Duone: Based on the Skeleton framework, HTML5 Fluid grid. (Drupal 7 only).