[Hampshire] Emulating a cluster with QEMU?

Hi all,

With all this virtualisation talk I was wondering if anyone has tried
running multiple instances of QEMU on one host simultaneously?

What I would like to emulate is a cluster with each QEMU node able to
talk to all the others in the cluster plus the host via normal
networking. I assume this should be possible but has anyone already
done this and have any notes? Any gotchas to watch out for?

Obviously performance is not going to be great, but I just don't have
8 PC's sitting round at the moment. :o(

TIA
Rich