But we still need to charge devices when we're on the road and if you don't have a newer car with a built in USB port you're back to adapters. Fortunately, the good people at Instructables have come to the rescue with a step by step guide to adding a USB power port to your car. You'll need a $1.16 USB charger from which to scavenge the port, and we highly recommend Monoprice.com for all your ultra-cheap cable and charger needs. Even if your car already has a port for an iPod interface, you may want to add one or two extras just for charging other devices. So that's your weekend project. Get started!