I got it installed on a virtual machine and now I can really give my first impression...
Wow.... its windows vista ! OMFG!
Seriously... the windows 7 beta makes it look like the entire windows vista release has been a beta and a means to make money by selling it while doing extended testing and development to it.
Maybe they should have waited another year or 2 before a complete vista release; and not let a handful of computer illiterates whine about how they can't comprehend the tiny differences between windows 2000, xp, and vista. UAC !!! OMG! it's now easier to turn off.
If vista had shipped with UAC on a very low setting or disabled, I really think there would be a significantly smaller number of vista haters out there.