Just installed it in parallels on my OSX system
so far, Windows 7 runs fine even in a VM environment. Gonna test it on full hardware later. Doesn't seem too much different from Vista in terms of interface, but those UAC crap are all gone, installation is faster, boot up screen is nicer. and it seems to use less memory then Vista. The new task bar needs some time to get used to. I can't wait for the final version to be released.
Boot Up
Desktop
