For any of U that want to hear some great radio programming (without commercial) XM has just gone online and from what I heard at a friends - it's a blast (unfortunately if U have a MAC like I do, no go yet). This is what radio should sound like.

There's a 3-day trial, here's the link
http://www.xmradio.com/xstream/

Mac guy here.
I've heard of this as well. At the last streetpainting festival, one of the guys that was working next to me had a boom box that tuned into XM Radio. Very cool stuff.