An Audio Podcast is

• An informative or entertaining audio piece that is circulated on the web.
• Podcasts mix voice and music and are usually produced by individuals or amateur, non-commerical groups with modest technology.
• They can be listened to on the PC by visiting a website; but many use I-Tunes? to subscribe to the feed and automatically download new material to their I-pods.
• One directory, Podcastalley.com, lists 39,000 podcasts with 2.5 million episodes.