AMD talks about this feature on its website but we found a few more details about it. AMD-V is a feature built in the new processor. The feature is called Device Exclusion Vector. It separates several virtual machines out of other.
This is very useful for servers as you can run more operating systems on the same server at the same time, seamlessly. Intel has this feature for a while but you need software to manage it, while AMD does everything in hardware and executes faster.
Barcelona has some fighting points and Intel knows it and is preparing fot the soon to come K10 server part.