This is an excellent test...thank you for doing all of this work. I'm sad to hear that Vista is any bit slower, but I'm happy to see that I'm not the only one who believes the media is stating exaggerated numbers. I can't understand why there is such a general hatred of Vista...it's really not that bad, or bad at all.
My only real complaint is that Microsoft consistently has the worst UI/User Experience. I wish they would realize how far smooth transitions and minor usability features would get them.