If you've ever started your day with a dead car battery, you'll appreciate the SolarCharger 135 by ICP Solar. It attaches to the inside of your windshield via suction cups and uses solar power to maintain the "constant trickle charge" your vehicle's battery requires for good health. It's available for $40 bucks and works with ATVs, boats and other 12-volt vehicles.
Product Page [via Sci Fi Tech]