A recently-unearthed patent from Apple Corp. reveals the design of a compact — and utterly revolutionary — dual-sided handheld device that could very well be the "iPhone Nano" that's achieved Lock Ness Monster status over the last year or so.
The dual-faced device reported has a a full-face display on one side, and a force-sensitive touch based surface with etched controls on the other. In essence, what you see happen while watching the front screen is controlled by finger presses/movements on the backside. It's not transparent, as you might think by looking at the diagrams.
Aside from the mental shift involved in this touch-the-back-and-see-the-result-in-the-front paradigm, it would be interesting to see if separating a "touchscreen" into its separate (i.e. touch and screen) components would result in longer life and/or better performance for either or both elements. Keep in mind, too, that this patent comes from John G. Elias (ex-Fingerworks), who's already working at the House of Jobs on other sophisticated touch-related patents.