Check out this neat site I found called LibriVox. From their site:
LibriVox volunteers record chapters of books in the public domain and release the audio files back onto the net. Our goal is to make all public domain books available as free audio books. We are a totally volunteer, open source, free content, public domain project.
More books and/or chapters are recorded every day. And if you have some time to spare and think you’ve got the right timbre in your voice, why not have a go at volunteering to record some chapters yourself?
I’m downloading The Red Badge Of Courage right now. This should make the long commutes more enjoyable.