What are Podcasts?
Podcasts are like having a magazine subscription, whenever a new issue is printed it is delivered to your mailbox. You can subscribe to a podcast and whenever a new episode is available it is automatically delivered to you, in most cases. Podcasts are audio programs, sometimes they are video, and i call them Vlogs. Podcasts are available in different formats. A couple of them are wmv and mp3.
Check out what others are saying about Podcasting.
Wikipedia on podcasting
Podcast Pickle on Podcasting
Creative Commons Guide to Podcasting
