Dolphin x64 Emulator
I recently bought Windows Home Premium x64 Vista to try out x64 Dolphin, as you can see it is really fast.
It supports OpenGl and some basic Wii support, it also supports an Xbox Controller, up to four =)
Dolphin now has it's own offical webpage, visit it for more information!:
http://www.dolphin-emu.com/
You can download the basic emulator here:
http://www.dolphin-emu.com
And the SVN release(that I am using in this video, the 126) here:
http://www.code.google.com/p/dolphin-emu
If you don't have any C++ software, then you can download the latest 32/86-version from this link:
http://nyleveia.com/daco/
And 64-bit:
http://nyleveia.com/daco/
Linux(this might not work perfect)
http://nyleveia.com/daco/
(NOTE: These downloads are not directed to me, so all the credit goes to "daco")
Good luck!