Vista Horizons

I just managed to find the time to install 5536 last night and here we have RC1. Looks like it will probably be available to a wider audience next week.
Jim Alchin tells the TechBeta community:

It’s official — Windows Vista RC1 is done!
We could not have achieved this milestone without your support. The quantity and quality of feedback and data we received from you has been essential to helping us progress. Thus we wanted you to be the first customers outside of Microsoft to get access to the bits. Next week, a broader set of technical customers will get them via MSDN and TechNet. But you’re the first! We wanted to get it into your hands asap so you can start giving us feedback right away.
You’ll notice a lot of improvements since Beta 2. We’ve made some UI adjustments, added more device drivers, and enhanced performance. We’re not done yet, however — quality will continue to improve. We’ll keep plugging away on application compatibility, as well as fit and finish, until RTM. If you are an ISV, RC1 is the build you should use for certifying your application.
The operating system is in great shape with RC1, but there’s still a lot of testing to do. You’ve come through for us so far, and I’m asking you to once again put the pedal to the metal and send us feedback. Windows Vista is going to touch hundreds of millions of lives all around the world. Thanks for everything you’re doing to help us give them the best experience possible.