Jason Weaver has posted an excellent discussion of a design pattern for responsive design that he labels “Off Canvas”.
Inspired by the observations of Luke Wroblewski, this Off Canvas layout demo has 3 panels that display differently depending on the viewport width. The idea here is to have the two supporting panels of navigation and sidebar content hidden just off-screen to the left and right for easy access on small/medium viewports.
See the Entire article here: Off Canvas.