Black Hat risk to migrating VMs

I like the Black Hat conferences, not least because they always manage to produce a balanced measure of truly mind boggling security holes on the one hand and truly mind boggling self-serving smoke and mirrors on the other. I am not 100 percent sure where stories such as the RFID credit card hack fit into the balance, but there is little doubting the relevance of demonstrations such as the one which showed exactly how a determined attacker is able to hack into VMware and Xen virtualisation software while the VM is in transit between physical machines.