Podcast

A podcast is a collection of digital media files which is distributed over the Internet, often using syndication feeds, for playback on portable media players and personal computers. The term podcast, like "broadcast", can refer either to the series of content itself or to the method by which it is syndicated; the latter is also termed podcasting. The host or author of a podcast is often called a podcaster.

source:http://en.wikipedia.org/wiki/Podcast

Podcast is a good tool to learn English. You can download the files, so you can listen to it everywhere. The following are that Podcasting Resources : (All resource are free.!!!)

1. BBC:http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/default.stm
2. Lonely Planet Travelcast:http://www.lonelyplanet.com/travelstories/podcast/
3. NPR:http://www.onthemedia.org/
4. Storynory:http://storynory.com/
5. Times:http://www.time.com/time/magazine/article/0,9171,1189268,00.html