This player is great, just go thru the simple set up and bam! You got Sirius radio on your mac (Sirius Subscription Required). I love it! I suggest if you use this app and really appreciate what they've done, that a small donation is made, they deserve it!
The application, I believe was built using python.
To get it just go to the following links...
UPDATE: SiriusMac is programmed entirely in AppleScript Studio.