I discovered books on tape (now CD) at our local library and never looked back. It is a great use of driving time, doesn't strain your eyes and it is free.
Our library now has a deal where you can down load books on MP3 from a large data base. I just plug my MP3 player into a little FM transmitter that plugs into the cigarette lighter socket and listen to the books on the radio. If you have one of those
fancy cars, you plug the MP3 player straight into the radio.
The beauty of it is that you never have to go to the library to pick it up, nor return the "book".
I download podcasts, too, especially when I fly and need something to keep me occupied.