Podcasting lets anybody with a microphone, a computer and an Internet connection publish audio shows that can be listened to by people anywhere in the world. Because the barriers to entry are very low, podcasting is rapidly becoming a popular way for people share audio/video shows. Podcasts are free and can be automatically downloaded to portable media players, so you can listen to them whenever it's convenient.
Coolest of all is that if you've got a great idea for a podcast, you can probably do it!
There are already many types of podcasts, including audio books, music shows, news, humor and sports. Most podcasts are created by amateurs, but there are also commercial podcasts and independently produced podcasts. There are podcasts in Dutch, French, German, Icelandic, Italian, Mohawk, Spanish, and many other languages From podcastingnews.com