I have a subscription to Audible.com which I download books, articles, all kinds of things to listen to on my iPod.
I prefer the iPod and downloading books to CDs because you don't have to try and change the CD while driving, carry a bunch of CDs with you, and you can also use it on a train or while walking or cleaning house, etc.
Our whole family listened to the Narnia series during car trips to grandma and grandpa. Just about all new books are available in audio format- really anything that interests you. My mom loves to listen to biographies of historical people, some people like to listen to the Bible ( there is a wonderful audio version with different chapters being read by many famous actors with amazing voices). I like listening to mystery novels or light fiction while I'm driving- what ever you like, you'll be able to find an audio version of it.
I can absolutely recommend the audio edition of The Help by Katheryn Stockett. Even if you've read the book, the audio version is SO well read- it will keep you listening even after you pull into the garage!
I also download radio programs like This American Life. Go check out Audible.com
If you are going to be commuting a lot, I think an iPod is a great investment. You can listen to music you enjoy, play Christmas carols in the car, listen to books. If your car doesn't have an automatic adaptor, you can get one that works with your radio for the iPod to plug into at any Best Buy or similar store. If money is an issue, getting books on CD from the library is a great way to start- but if you are like me, you will soon be hooked and want an iPod to listen more easily. Good luck and happy listening!