MPlayer can cope with all manner of formats, including the new Shoutcast streams. MPlayer is free and works on Windows, Apple, Linux and other computers. There are several other similar alternatives to MPlayer.
The ONLY thing stopping this from working is that the BBC won't tell anyone what the new addresses for the streams are!
C'mon folks, I pay my twelve quid a month, all I want to do is listen to what I've paid for, using the equipment I already own which is already capable.