Nice work Russ.
I had a play with Qemu on FC4 and have the linux.img running but havn't
loaded an XP image yet.
I have been using VM Ware for many years - it allows me to run several
instances of Win2K, each with a separate version of MS Access (so they
don't argue). It is also great for the snapshot facility so you can
test software against a fresh PC every time and you don't have to worry
about old .dlls lying around.
We should also take a look at CoLinux - great for laptops.