I have recently become completely dissatisfied with the state of radio. It seems like there are more commercials, less music and little differentiation between radio stations at least in Washington DC. I can't add satellite radio in my current car, but that is something I will be doing when I buy a new one in a couple years. I've been trying to figure out what to do until then, settled on podcasts and have very impressed. I started off with a16z, CFR and WSJ and could not be happier with the decision.
Most of us spend so much time on our cars and for the most part it feels like a complete waste, but with podcasts that's not the case. I am able to consume the content I wants on my time and with minimal interruption. Its nice getting out of the car after a 30 minute drive and feeling a little bit more informed. Even better is the feeling of turning sitting in a car into productive time in my day.