Perhaps the most novel non-gaming function of the tablet-esque controller is its IR-based universal remote control ability -- the GamePad can be used to control your HDTV (well, "most" HDTVs) in some basic, but very important, ways.
But it also has a more enterprise-focused feature, in the form of a slideshow function in cahoots with the Polaris Office app, which means you can use your GS III as a controller for a presentation.