We provide access to a diverse range of Internet radio stations from around the world, with broadcasts from nearly every country on the planet. We provide both live and on-demand ("listen again") content and we support Real Audio, Windows and MP3 streams.
They have thousands of stations, and a lot of them are very specialised. At the moment I am mainly listening to ancient.fm which is mediaeval music 24/7, and some swing stations from the US (and the usual British stations I listen to anyway).