USB charging devices seem to multiply every day, and so having a USB port handy to charge from can make your device usage much easier. The 4 port USB Hub and Charger plugs into an available 12v auto accessory port (cigarette lighter, if you will) and gives you 4 ports in a hub to connect through and charge from. Plus, the 12v port is still available for other devices thanks to a pass-through design.
The charger supports high power output up to 2000 ma, so powering those bigger USB devices should not be a problem. The device has its own internal changeable fuse in case there is a problem, avoiding issues with the car's electrical system.
The 4 port USB Hub and Charger costs $30, and you can find it at USB Fever.