I noticed my machine running slower lately, and UrgeMS.exe (URGE Media Scanner) was thrashing the disk and running up to 50% CPU.
Obviously, this is part of MTV's URGE music store, the default store for Windows Media Player 11. It appears that the process is related to the "Auto-Mix" feature, which I don't use enough to justify the serious performance impact. I have a fairly large music collection, but it doesn't seem to ever let up.
One forum post suggests disabling this via Local Security Policy.
Great idea! My system definitely runs better now. Hopefully this is something they address in the future...
Update
As John mentioned in the comments, you can also prevent this from running by setting "HKEY_CURRENT_USER\Software\MTV Networks\Urge\Scanner\Enabled" to 0. If you don't want to mess around with the registry, simply download the attached registry key and double-click on it.
Update #2
This fix no longer works. You can replace the UrgeMS.exe with an "empty" executable though.