I just recently (like in the last few months) figured out how to listen to my ipod in the car. I'm a technical genius! This discovery however has changed what gets listened to most in the car - it depends on who is in the car with me. When I am driving Devon or Courtney to school it can vary from Aerosmith to Kanye to the soundtrack from Les Miserables. When I have the elementary school kids in the car they will want to listen to Ke$ha or Inside Out's primary songs.
When I am by myself I listen to conference talks or Josh Grobin or Michael Buble. I enjoy what little time I have in the car alone by listening to what I like.