I have been using UxM for quite a while and found it is now completely broken and the author has disappeared. Here is a new tool that accomplishes the same thing. You can stream XM or Sirius through TVersity and it will allow you to play through your HR20 hardware or PS3/XBox. It also has its own player so you can listen online without launching XMs player.

SiriusXMStreamer - Sirius|XM Internet Radio Stream Proxy (http://www.permanence.com/sirius/)