I think that the this is primarily a promotional program.

Version 5 has been throughly tested and developed with a target sale of the
growing Ubuntu community.

On my wife's new hp dv6810us (AMD 2Ghz, 3GB ram) laptop, WinXP runs
absolutely perfect in a virtual machine inside Ubuntu 8.04. Even though the
laptop has a 64bit CPU, I installed the 32bit Ubuntu and WinXP Home as the
guest.