I recently uploaded the last few chapters of 'Harry Potter and The Deathly Hallows' onto my iPod and have been listening to them as I walk to school. Not only has it made the walk more enjoyable, but I've noticed that hearing the words out loud has helped me be aware of J.K. Rowling's voice, phrases and word choice in a way you just don't pick up from words on a page. I think listening to music is great too, and there are some incredible lyricists out there, but why not try shaking it up with some audiobooks, and using your iPod time to be taught and inspired by the greats.
Now, audio books are pretty expensive, and writers aren't typically known for their vast financial resources, so unless you have parents or friends with an awesome audio book library that you can mooch, there are a few things you can do to keep expenses down. I've been haunting the 'Free on iTunes' section of the iTunes store, and have found a few gems. I've found excerpts from newly released novels, and even a section of 'Fantastic Mr. Fox' read by Roald Dahl himself. And if you don't mind unprofessional readings, LibriVox has a huge audio library of public domain books. Here is a list of sites that offer free public domain audio books but LibriVox is the main one. Also, iTunes offers free podcasts of some of the classics, and that might be worth checking out.
If there are better/more sources for audio books out there, I would love to know. Happy listening!