I woke up early today morning, so i could play around with the Beta 2 build, and here are my thoughts:
Installation on my slow Maxtor 15GB disk took roughly 1 hour 15mins from booting up the installer to finish. Faster than previous builds. They cleaned up the interface and looks pretty good. Total space (default@Vista Ultimate Edition) = 6.67GB + 2.3GB for the page file = ~ 10GB. You can change the pagefile size later on though, like I did to 1GB.
Boot times are impressive; pretty much like my primary Win XP installation. Performance has further improved (from the last build 5365 that I had). No sluggish menus, loads, , hdd thrashing, etc. Bear in mind, that this is on my slower Maxtor 15Gb. If I install on the primary WD80GB, there shoud be further (though slight) loading benefits.
RAM usage = Heavy. Windows Classic theme @desktop with only the sidebar running (and other default services left on, untweaked) took up about 502MB of RAM. Changing to Windows Aero saw the usage go up to 680MB. Taskbar shows(with IE7 and 6 tabs open) RAM usage at roughly around 740MB. 2Gigs definately!
I don't like the default Start Menu options, though it is easily tweaked.
I'm gonna have to get used to the new default Explorer setup. Classic menus and folders is still available for those wondering.
For the ATI users, the Catalyst for Longhorn Beta 2 installs fine. Current driver revision adds Adaptive AA in the CCC options. Drivers (as before) show a GDI version of 9ex.
Might try some D3D and OGL demos on it later after lunch.

After reading your review, i don't think i want to install vista. Need at least 1GB ram
normal minima memory requirements for high end games = 1GB
best performance = 2gb
