I’ve been consuming any and all information on Responsive Design that I can my hands on. Here is a list that may or may not be updated:)
Ethan Marcotte is widely believed to be one of the visionaries in the Responsive Design movement — he gave us the three terms: Fluid Grids, Media Queries, and Flexible Media.
Brad Frost runs an amazing site — he also designed TechCrunch’s responsive layout.
Eric Meyer provides a great Reset.css file — also see his Reset Reasoning post.
Blueprint is a CSS framework that incorporates Eric’s Reset CSS.