Internet Radio 101
BusinessWeek - Internet Radio 101: "For the most part, regular folks are doing these shows, although a handful of traditional stations, primarily National Public Radio affiliates, have joined the podcasting world. [...] The quality of most of the 3,500 podcasts now available is all over the map. And because they're based on individual interests, they can dip into arcane topics or music that perhaps only people with similar tastes will appreciate. But that's their beauty -- they don't have to adhere to mainstream tastes."