Three designs for eco-friendly phones of the future uses the repetitive motions inherent in phone usage to generate power. Designed by ModeLabs, you can download the press release at their site.
The U-Turn (picture shown here) uses an Azerty keypad, which is a modified version of the QWERTY, which stores energy every time the user closes or opens and opens it.
The Yo-Yo has two ways of storing energy: from photovaltic cells and from a pendulum.
The Runaway is worn on the wrist or affixed to an exercise equipment so the phone charges while you're working out.