GSI Super Quality In-Car Wireless Hands-Free FM Modulator-Transmitter for MP3/MP4/iPod/iPhone/CD/DVD Players - SD/Memory Card/Flash Slot - Line-In Function - LCD Display - Cigarette Lighter Plug - Includes Remote Control - Yellow
purchased this just hoping it'd make a long trip a bit easier  (not changing radio stations all the time and better music selection) and it works wonderfully. i use it nearly every day on my work commute. the wide selection of channel choices makes it easy to find a blank station.