iPod (and less hip mp3 player) Users: Have you guys tried getting your songs to play on your car radio at all? There's that nifty little device that plays through the radio, but I'm curious as to whether that would work with my old skool 15 GB model. And of course I'm always looking for a cheaper alternative. I have no CD player in my car, just a tape deck, but I also wonder if one of those CD player tapes would work too. And then there's mention of cables and audio in/out... On the whole, I'd appreciate some experience talking.