Well I've been working on my article for Windows 7 x64 vs Vista x64 on my new Quad-Core budget PC that I built for some home gaming, and I just started doing the benchmarks for Windows 7 in overclocked form. I must say... I'm extremely surprised that I'm not seeing the same results that everyone else is seeing.
I thought that when I was doing the comparison at stock speeds, I would see a bigger difference once I overclocked, but even now, it is pretty much the same and even slower in some cases.
If I had to take a guess as to what is going on, I'd say that there are still some driver issues to be worked out. The parts are all pretty new parts, but I was able to install all of the drivers in Windows 7 without a problem.
Anyways, it looks like I might end up choosing Vista to run on my home PC. I'm itchin to start playing some CS:S, Crysis and World in Conflict.
Check out the article I just finished... It's a HOWTO on installing and configuring Windows 7 x64 in VMWare Fusion, which is VMWare's workstation product for Mac OS X.
I've had it running on my 8-Core Mac Pro for a little while now