Got windows 7 build 7068 running in a VM today on my mac. Haven't done much with it yet other than a few basic settings, but it installed real fast and seems to run pretty quickly. I'll be loading up development tools tonight and we'll see how it performs under load. One thing I did notice different is that many of the panels in various windows (like control panel) have slide transitions, which I kind of liked.
Here's a few pictures:
How about with some mac wallpaper?