I'm posting right now with a X64 install.
Eh, seems the same. Is there supposed to be a dramatic speed increase or is it marginal? Do I have to have 64-bit drivers for every single device? I looked but couldn't find 64-bit drivers for my printer or my Audigy 2. I could use the MB on-board sound though.
Edit:
Also, every post after the initial post on the forum has the text centered. I just installed this and haven't changed any settings. Very strange. It also won't let me go to the Windows Update site although I suspect it's because it's a beta.