Monster Cable iCarPlay Plus FM Transmitter for iPod
A lot of iPod radio players are really bad. No matter what station you put it on you just cant seem to rid the Christian Rock static noise in the background. This one actually suggests a station for you to use based on the best frequency in the area for itself. "The humans are dead..."
This has served me well on a number of long car trips. Our car doesn't have a CD player, but I prefer my iPod anyway - I can carry along a much better variety in music in a smaller package!