I listened to XM everywhere until sirius broke the damn been-forever WMV streamer, and I'm too lazy/busy to make it work on my OS again.
The funny part, though, is the radios themselves rely on the update protocol I used, so my little sig still works:
I find myself usually streaming off of the net, but when I get sick of Pandora playing the same stuff, or the 'all the same hair band crap', or 'electronica from 2001', I'll flick on the radio or grab a CD.