I finally got to trying out the beta, and it is awesome. The new taskbar is great, speed is fantastic, the overall look is sleek but not trying too hard. The windows sidebar is gone, replaced by gadgets you can place anywhere you want. Taskbar search seems much faster, launcing applications is at least as responsive as XP, user account control (the annoying 'Are you sure' box), is MUCH less intrusive.
I'm running this in a virtual machine using Sun's free VirtualBox software, and the performance even in a virtual machine running on top of XP with just 1GB of RAM allocated to it is surprisingly snappy. At boot, the OS only uses about 400MB of the available RAM. I am running the virtual machine off a USB 2.0 external 2.5" hard drive, boot time is less than a minute even on this slower disk (it would be concievable that boot time would be 20 seconds or so on a faster hard disk with the OS running native instead of as a virtual machine).
Every so often, MS releases a crappy OS, then follows up with a winner. Vista is like Windows ME (rushed, slow, everybody hates it), and Windows 7 is like XP- In my opinion, they are about to redeem themselves.











