Microsoft has just launched the CPP (Customer Preview Program) for the first Release Candidate of Windows Vista. I'm not a fan but if you are you can download both the 32 as the 64-bit versions of Windows Vista RC1 here:
http://download.windowsvista.com/preview/rc1/en/download.htm
I recommend that you use a download manager. I have been using Internet Download Manager for a while and I am pretty happy about it.
Cross-posted from
The .NET Aficionado