I was able to get Windows 7 running on my 1st gen MBA, with everything working except the wireless (but have found driver that I will test soon). Battery life is as good if not better than OS X, boot times are quicker than OS X and the MBA doesn't appear to get anywhere near as hot as it does in OS X when idling. CPU usage is 0-1% on idle but soon whacks up when screen grab is used, youttube CPU requirements are very low (which is to be expected) also even though this is pre beta the OS feels incredibly smooth, I have attached some screen shots below. I also installed on my iMac and the only things to report there are that sound and wireless require 3rd party drivers (as with MBA) and it refuses to play Blu-Rays or HD-DVDs no matter which powerdvd you use, (the blu-ray/hd-dvd drive is a sata device connected y a sata to usb adapter...) it simply says 'cannot recognise the format' even though windows know its a blu-ray and i can go and explore files on the disk. anyway here are photos and I will also try and make a video at some point: