I've got a rev B macbook air with the SSD drive and I just got done installing Windows 7 RC1 x64 on it. I didn't do it through OSx at all, rather I just formatted the entire drive and let the Windows CD reformat everything, choosing to boot from the installation CD. So there is no Mac OSx installed at all, I have no use for it. Just a single boot into Win7. After it was all installed I then installed boot camp, then the x64 update for boot camp on Apple's site. There is also a new Realtek sound driver, otherwise I just let Windows update install whatever drivers it wanted to. I am quite amazed it ALL works. Even the function keys like brightness and keyboard brightness all work perfectly. Even more amazing I brought home a wireless mighty mouse from the store today and was sure, after reading many reviews, that it would not work 100%, or even 75% based on the poor reviews. Well out of the box it works 100%, every single button works. The left and right main buttons work, the scroll works both horizontally and vertically, the middle button works, and the squeeze buttons work to go backwards while web surfing. Weird part is that ONLY the left or right squeeze button go back, you don't have to press them both. I'd love a way to configure one of them to be forward as it is apparent they do in fact work independently. Win7 runs amazing on this macbook air!!