Its usually a free audio recording of specific content, I have my own, its just fun to do, and listen to other guys podcasts like Black Water Bassin on my MP# player on the way to the lake.
If you do not have an ipod, or mp3 player, you can burn them on cd for your truck.
Check out itunes or search for one on google.com, I csnt advertise mine here so I dont want to give you a specific link, but a google search for "bass fishing podcast" will help you.
You can also find that you can just click on the recording to listen on your computer.