While we have recently had a lot of ideas about using wubi and grub for
duel booting. I find that for my use and the fact that I need to be able
to run more that one system the use of extra hardware makes life much
simpler.

I have three computers. A powerful AMD tower running XP, an older Intel
running Hardy Heron and a laptop running Vista. These are all linked to
a router for ISP connection. Tower via Ethernet and laptop via wireless.
All three are connected to a KVM changer to one keyboard, mouse and
monitor, so with one button I can change backwards and forwards between
the three systems at will.

When I take the laptop out with me I have Hardy Heron via wabi installed
with Vista as duel boot.