Sometimes, sites such as the BBC make certain audio/video programmes or features available in a similar way; these have come to be known as Podcasts, a term derived from making broadcasts for the iPod. Apple's iTunes software has an excellent interface for downloading podcasts, but if you're not an iTunes user, there are other clients that can download these (which most do automatically as they are made available). My recommendation is Juice. You can find new podcasts by looking at one of the many directories (e.g. learnoutloud.com, podcast.net) or finding podcast-friendly news sites, such as the BBC's Podcast Directory.