Here is my tech tip of the week. If you are like me, you have some old USB drives or SD cards that are less than a gig sitting around in a drawer. With one of those, and about 10 bucks, you could have a really nice car MP3 player. You slap some of that memory (loaded with Mp3s) in one of these, and you are good to go.
The player plugs into your car lighter and broadcasts to an empty FM station. It can easily be moved from car to car. I keep a drive of music and a drive of books and lectures in the glove compartment. I got the one in picture for less than 10 bucks from Meritline.com . So if remembering the ipod is touch and go, or you are tired of having discs all over the passenger seat.... here ya go.