Ah, sometimes I forget that a large percentage of Mac users are liberal bedwetters...
In all seriousness, it's not an .mp3 stream. It's a .asx stream, and it works just fine with WMP 7 for Mac and WMP 6 and higher for Windows. I've found several sites that support WMP but won't work for whatever reason with the new OS X version. Very bad news. I was hoping WMP for OS X would allow me to watch most of the content I was loading Classic for, but until Real shows up with their OS X port, I guess I'm screwed.
And, hey, cut Rush some slack - he's been one of the biggest supporters of the Mac platform for years. He plugs the equipment daily on his show, and can be seen with his huge 22" Cinema display on his webcam.