As several people have already noted, Windows Vista Build 5728 is now available for download. It’s an update to RC1 that has quite a few bug fixes and cosmetic tweaks. Before you head off to download it, though, read this paragraph from the official download page at least twice:
This build (5728) has a number of improvements and updates from RC1, but has not been put through the same internal testing process as RC1 and therefore may be unstable in certain installations. We are making this release available for a limited time only (and only by download) in order to get broad distribution and testing in a variety of PC configurations. Please note: This build may not have the same level of support or servicing via Windows Update, and you may not be able to upgrade to the final version of Windows Vista.
Personally, I am continuing to use RC1 on a couple of production systems (including the one I’m using to create this post). I’m installing 5728 and other interim beta releases on virtual machines and non-critical systems that I know I will reformat many times between now and January. (The RC1 download is still available here.)
Seriously, if you’re thinking about installing this build on a system that contains critical apps or data, go back and read that paragraph above three more times.
Ed Bott 
Surprisingly Ed, this one is pretty good (i.e., 5728) and it’s stable. This was the first ISO that was cranky if not burned at a slow speed (finally 2.4 got it right).
Weird though that M/S giveth and also taketh away. For example, now my Dell 19″ ultarsharp can install a driver, but Trillian (my IM program) now no longer works correctly, and incites Vista to change video modes (aero to basic) due to some incompatibility and screws custom personalization all to hell.
Also, still not present is a solution for my Canon scanner (4200F) or my Canon Digital camera (S40).
Subtle changes in Outlook. Navigation pane for example has been changed. Also, lost all my rules (over 100) when installing and applying the TR. Fortunately, backed up nicely prior to the install.
Keep plugging I guess.
I’ve signed up for the Install Fair in Mountain View, so I’ve yet to install Vista on my Tablet PC. Since my Tablet PC has integrated Intel graphics, I’m SOL when it comes to Aero glass. At least, I thought so. On a Tablet PC enthusiasts site its been reported that Aero Glass now works on an under-speced Toshiba M200 by default. The site says the graphic card now shares system memory…
Are changes being made to Aero Glass to support more hardware?