I have Windows 7 running under Parallels on my MacBook White. For some reason, it seems to always be at 100% CPU Usage. Also, I read in several forums that Aero both for Vista and Windows 7 won't work if booted under a virtual machine. I've also read in a lot of articles, including this thread that Windows 7 runs seamlessly on low end configurations, contrary to what I'm experiencing under Parallels. However, I think if I boot Windows 7 native with Boot Camp, I'll probably get that wow experience. I'll probably end up buying the OS when it comes out for my home PC. For the moment, Leopard is still by far the most superior OS for me.