Just discovered that you can listen to just about all the XM Radio sample channels. Just place the following url into your IE
http://www.xmradio.com/metafiles/71.asx
71 is the channel number, it happens to be the Cool Jazz Channel, but you can simply use the other channels in it's place. You may wish to see all the channles available at the web site
http://www.xmradio.com