FlyCast is an application that runs on iPhones, the iPod Touch, some Blackberries, and the T-Mobile G1. Recently, an Adobe Air version that runs on Windows desktops has become available.
FlyCast is a free, ad-supported service. On their download page, they make this statement: "FlyCast is a free service that gives you what you really want – portable music and talk radio that’s better than Satellite radio, easy to use, and works on the device already in your pocket . . ."
"Better than satellite radio" caught my attention, as I was listening to XM radio through my PC at the time. Interested, I decided to download the application and try it out.
Let's state the conclusion first, just to get it out of the way: FlyCast is mostly just radio stations streamed over the Internet. It's over a thousand stations, though, and weather information for many cities. The major use for FlyCast on the desktop will be to listen to distant commercial stations that you can't tune in locally on a . . . radio.