Now that I've got a fancy new phone Dick Tracy could've only dreamed about, I can listen to mp3's all day long.
There are all kinds of great free sermons & lectures online. One of the first things I listened to was this fantastic series of lectures on baptism by Norman Shepherd available from Trinity Presbyterian's (Birmingham, Alabama) Norman Shepherd Project:
1982 Baptism Lectures
1. The Baptism of Noah and His Household
2. The Baptism of Moses and the Children of Israel
3. The Circumcision of Abraham and His Descendants
4. The Circumcision and Baptism of Jesus
5. The Efficacy of Christian Baptism
Also good is Vishal Mangalwadi's Heretics Series, available from the MacLaurin Institute. (Thanks for the hook-up, Russ!)
I would be remiss to mention the man himself, Dennis Prager. All of his radio programs of the last few years are available on podcast, also for free.
Here are hundreds of hours of spiritually edifying and informative listening. And this is only the tip of the iceberg! It's mindboggling to think about the possibilities the Internet holds for disseminating quality information on such an unprecedented (virtually limitless) scale. Sure, there's a lot of junk out there, but at least the good stuff is there for people who look for it.