Well I got Vista installed and instead of trying to run the setup.exe for the osx to install the boot camp drivers, I explored the contents of the disc and found individual 64-bit drivers that I could run for the graphics card, network settings, and some other things I can't remember at the moment.
What I really need though is for a way to install the drivers for my sound card, as I'm using some realtek sound drivers that have been annoying so far, and drivers for my keyboard so I can use the volume buttons as well as the F keys. If I can get those I think I'll be pretty satisfied until apple starts supporting 64-bit copies of vista for iMac users, which I hope is soon.