After getting fed up with ATI not having any chipset drivers for x64, I emailed MSI and they sent me a link to one of their non-public FTPs that actually had a not-beta-but-not-public chipset driver for x64. I tried it, it works, so here it is!
http://files.darkringmedia.com/ATIChipsetx64driver.rarIt's 23MB, so be nice!

As far as I know you can't find these elsewhere.
Edit: It seems that when I downloaded the files from the MSI FTP, I missed a few - updating now, should have the full thing up shortly!
Edit2: Finished Uploading - Final size is 33.2MB