Please don't take this the wrong way; I don't want to insult your intelligence, you probably already know this, and I'm just inserting random (self aggrandizing) noise into this thread.

You are aware that it is possible to run quite a few linux desktops on the tablets without using a virtual machine? You can run a second desktop in a chroot using a nested X server (I use Xephyr). My Easy Debian project allows you to put a different Linux distro (in this case, Debian) into an image file and then chroot into it and run applications from within it. A chroot, however, is just a virtual environment, not a virtual machine, so you don't need compatible libraries, but you do have to have a compatible kernel...

Is there a specific reason that you wish to go the route of full virtualization? Do you want a different kernel?