My brother's friend's mom drives me to school every morning. I never really payed attention to how she does it, but I do know that she plays music from her iPod to the car. I think there is a wire that connects to the car and the iPod, but I'm not completely sure to be honest with you. :l
My car still only has a cassette player (its an '07 Taurus) and I have a cassette tape that you plug into your ipod and then put that in your cassette player like a regular tape... I think I might have gotten it from radio shack awhile back but I'm not positive for sure.