Charge While You Park! Cool!
Place this ICP Solar Sunsei SolarCharger SE-135 on your car's dashboard, and trickle charge your car's battery whenever the sun's out. It's supposed to increase your car battery's life, and is not intended to charge it up from scratch. Designed for any 12-volt battery, you can either lay it on your car's dashboard or use its suction cups to attach it to the windshield.
Buy yours [here]