The release notes say this SDK is compatible with Vista RTM which was always expected, but nice to see confirmed.
I downloaded copies of Vista x64 and Office 2007 after they came out but they've just been sitting around doing nothing - I didn't want to compromise my stable(ish) RC1 setup.
So, once I've done the xmas shopping today I'll be sitting staring at progress bars whilst I rebuild my Vista test machine.
Then all that remains is buying a GeForce 8800 and acquiring suitable drivers. Last I heard was that the drivers would be out for late December. I have to admit that if the rumours of ATI's R600 appearing in (late) January are true then it might well be worth hanging on - Nvidia lost the opportunity to get a big lead as far as I'm concerned.