Ethan Marcotte's book (http://www.abookapart.com/products/responsive-web-design http://www.abookapart.com/products/responsive-web-design) is pretty good. Not to

Ethan Marcotte's book (http://www.abookapart.com/products/responsive-web-design http://www.abookapart.com/products/responsive-web-design) is pretty good. Not too long, and yet goes over a lot of theory and examples on how to achieve a responsive design.