What is podcasting?
If you know how a desktop aggregator like NetNewsWire works, you know you subscribe to a set of RSS feeds. Using the aggregator you easily view the new stuff from all the feeds you have subscribed to together, or can see each feed separately. The format used is RSS 2.0 which supports enclosures.
Podcasting works in a similar way. Except, instead of having to read the new content on a computer screen, you can listen to the new audio content on a portable device like an iPod as well as your computer.
Using this technology is like giving your iPod a set of subscriptions that are checked regularly for updates. Today there are a limited number of programs available this way.
It has been described as being like underground radio. Except this broadcasting technology is becoming available to everyday users. It does for time based content, like audio and potentially video, what the web did for text publishing. It is the audio version of a blog!
I believe the implications of this for education are astounding and are just now being recognized.