Dugie's Penseive has a good summary of the virtualization presentation at IT Forum. He also brought some good points from the Window Server 2008 Technical Briefing I am helping some others chase down the facts from the Micosoft folks on more accurate #'s.
Also I second, Dugie's point on
I recommend checking out Michael Manos’s clip. Michael presented a session on Green data centers last week in Seattle , and there is some amazing work that Microsoft are doing in this space.