Topic: OpenBSD 4.3 on KVM (the linux hypervisor)
I thought I'd throw this tidbit out there...
use the em* interfaces ( "Intel PRO/1000MT (82540EM)" ) Because all the rest generate a boatload of timeouts, and don't work properly.
Otherwise, it works like a champ! I have 4 OpenBSD firewalls on my setup @ home alone!