Multiple Windows Media Player now compatible with Windows 8 (UPDATE)
UPDATE: Now works with Windows 8 RTM.
You can now run multiple copies of Windows Media Player on Windows 8 Release Preview.
I have updated the patch to make it compatible with Windows 8 RP: http://www.lukepaynesoftware.com/other/
Speaking of Windows 8, you may come across messages from Windows SmartScreen when trying to run various applications (mine included). You are able to still run the application by selecting “More info” on the first screen and then “Run anyway” on the second screen. You should only do this with software from a trusted source.