Belkin TuneCast

The Belkin TuneCast is a cool little gadget that broadcasts the sound from nearly any audio device to an unused FM radio station. It was designed with the Apple iPod in mind, but can be used with anything that has a standard headphone jack. Just plug the TuneCast into the device, select one of 4 frequencies to use, and then tune your radio to that frequency.

Works pretty well in the car and in the house, and is obviously pretty simple to use. The cable is attached but has a wraparound holder to keep it out of the way when not in use.