The Podcast revolution

Podcasting is the contraction of "broadcasting" and "ipod", it's a method of distributing multimedia files, such as audio or video programs. I think that podcast is not a program or a site, you need to have contents to diffuse it. That's why medias use this method to promote theirs programs, like radiofrance or the BBC.
Podcast is very useful as everybody can download a music or a video and listen to them with a mp3 reader or our computer without advertising and from a lot of country. For example you can listen the amercian Museum of Natural History lectures, it is very interesting!
Even if ipod is a mark i don't think that the word belongs to a company, it was used by media first and then everybody beacame to use it!