The Windows 8 Developer Preview installs easily on Qemu 0.14.1 on Ubuntu.
$ qemu-system-i386 -m 1024 -vga std -net nic -net user -cdrom w8.iso c.qcow2
Performance is… not good at all, but completely possible to get an impression of Windows 8 and Metro.
This is the x86 version – I have not completed the x64 version at this time. I will get back about the 64-bit version with developer tools.
Update: Well, the released version of Windows 8 is not very impressive. I think I lost my curiosity for WinRT for now. Perhaps my curiosity will awaken again, but for now I think my Windows 8 experimentation is over.
For those of you who want an idea… when you click “Start” to get the start menu, instead you get the full screen Metro interface where you start applications. And it starts with this Metro in full screen. And to get to the desktop, you start the Explorer application from the Metro interface. I think the start menu got larger in every version of Windows since NT4, and I never liked it. I don’t like it this time either.