Open Source Metempsychosis

When it comes to virtualisation, I still wonder what the fuss is about, since it all seems so, well, virtual. But even I have to admit this (warning: highly-level geekery) is seriously heavy:

Xen, an open source virtual machine (VM) monitor, works with just about any Linux distribution. One useful feature for shops that care about high availability is Xen's ability to migrate virtual machines while they are running.

...

With Xen and live migration, hardware can be replaced or upgraded without interruptions in service. Applications can be freed from the hardware they run on.

Metempsychosis, anyone?