While on a trip to Ohio this week (by myself) I listened to The Adventures of Huckleberry Finn, which occupied about ten of my 16 hours of drive time. The novel was very entertaining, the quality of the recording was top-notch - and best of all, it was FREE (and legal too). Like most classic literature, the text of Huck Finn is in the public domain. Loudlit.org is a non-profit effort that is working to record such texts and make them available. I ran across Loudlit via ITunes, where you can also find other educational content (such as foreign-language courses) for your commute.