Think of a podcast as a radio show. Each show consists of a series of individual episodes that you can listen to how you want be it from your laptop or your iPod. They are great fun to download and take with you as company on those looooong flights across the Pacific.
If you've never listened to podcasts, you're in for a treat. World Nomads will be interviewing some of our more intrepid travellers in the coming weeks and editing the stories from our many other travellers while they are all on the road.
If you still aren't sure what a podcast is, perhaps look at Ask a Ninja for his explanation! Then you'll be completely confused!