Just got a message from MTV's music store URGE that it has launched. I first heard about the service at MIX and today I got the launch email.
I just installed Media Player 11. This is a fantastic improvement over MP10. The visuals, search, etc... it's slick. You can install it here: http://www.microsoft.com/windows/windowsmedia/player/download/download.aspx
Now I'm heading over to URGE. Let me know whether you get it to work and what your thoughts are.