I have my own RTM copy through an MSDN subscription (work pays for it) so I don't condone what I'm about to tell you.
Now that's out of the way; The BIG news! MSFT is turning a blind eye to the KMS Activation servers running in China. So, you can download the RTM copy from torrents and you use a Volume Key (usually also given with the torrent) and use Volume Activation 2.0 to activate (a Vista Business or Enterprise edition ONLY) against the server, and the whole process is amazingly easy and takes about 1 minute to complete.
I tried it just to see how it works and it's flawless. It activates for 180 days and at that time it connects to the KMS server once again automatically and reactivates for another 180 days...and so on..... I could give links to all that I’m talking about but that would probably be going too far. So I’ll let anyone wanting Vista to do their own work.
I only say this here because I think it's unfair that MSFT is allowing people in China to use cracked versions of Vista and plans to do absolutely nothing about it; MSFT's way to combat Linux in China which is concerning to them, yet they go after everyone in North America with lawsuits and whatnot for even trying out their software.