Sun Releases VirtualBox 3.1 with "Teleportation", which lets you:
[...] move running VMs between machines - servers or clients, different architectures, different host operating systems, it doesn't matter to VirtualBox.
Looking forward to trying this out!
Definately trying this out right away!
Citrix XenServer also does this for free, but you need a proper NAS to make proper use of the feature, so it's still a "multi-thousand dollar option"
True, but you can hack up an NFS NAS fairly easily and cheaply (assuming it supports that as VMware does), but the vmware addition of vmotion is an extra tick on the PO just for the software option. Your point stands of course, to do it right you need "real" hardware behind it all :)