For those of you unfamiliar with the concept, podcasting is a blanket term used to describe a collection of technologies for automatically distributing audio and video 
programs over the internet via a publish and subscribe model. Podcasting enables independent producers to create self-published, syndicated “radio shows,” and gives broadcast radio or television programs a new distribution method.
In the podcasting model, the publisher publishes a list of programs in a special format, known as a “feed”, on the web. A user who wants to see or hear the podcast subscribes to the feed in special “podcatching” software (a type of aggregator), which periodically checks the feed and automatically downloads new programs as they become available. Typically, the podcatching software also transfers the program to a desktop or portable media player.
