http://www.redmondpie.com/you-can-now-run-x86-legacy-windows-apps-on-surface-windows-rt/
Now Microsoft tablets are much more interesting
allows running x86 Windows applications on Windows RT (ARM) tablets. The tool emulates x86 instructions and passes Windows API calls to WinRT kernel with necessary modifications.
Unless I am wrong, Windows RT ARM tablets are much cheaper than x86 based ones...