Griffin RoadTrip Ipod FM transmitter with cradle and charger for Ipod - White
Sounds good, and is simple to set up.  So far, however, I haven't been able to figure out how to get it to charge the i-pod.  I may be doing something wrong, however.  Overall I am satisfied, because I can play my i-pod in the car.  I bought another car i-pod player, which I had to throw away, because it didn't work at all.