USBFever.com has begun shipping its iPod USB FM Transmitter, enabling users to transmit iPod music over radio waves to a vehicle stereo system. Users simply plug the transmitter into the headphone jack of any MP3 player or PDA and turn on the car stereo to the clearest FM frequency. The device features a built-in USB interface for charging any USB-based device -- such as PDAs or GPS systems -- and offers a dock connector for Apple's iPod to charge the portable player while playing tunes over the stereo. The iPod USB FM Transmitter is priced at $30, and works with most portable media players.