I recommend you check out this website called "Faith By Hearing: Seize Your Commute."
What a great subtitle! Many of you drive more than one hour per day - learning the available options for listening to great free resources is a great opportunity to "seize your commute" for the glory of God and the good of your soul.
FBH is a great resource to check out with a healthy pool of listening resources.
Buying a good mp3 player can be a great investment when so many great resources are available online (to download) for free.