Solar Powered Mobile Phone, the Sharp Solar Hybrid 936SH to be released in Japan. The phone, offered by Softbank, has a large solar array up front that will give you one minute of call time or two hours of standby per 10 minutes of charging. The phone also features IPX7 water resistance, an 8 megapixel camera, and a full wide VGA display and is expected to be release in August. Sorry for Japan only.
More at Impress Watch (in Japanese)