Getting Chameleon to run properly on my Mac Pro 1,1 continues to elude me. I've followed all the steps on the Netkas forum precisely, except that I made a smaller boot partition (because 1GB is just silly and I assumed that was only required because that's the smallest that OSX's Disk Utility will allow). I guess the next thing to try is swap in another hard drive and give it a 1GB boot partition and see if that works -- and then I guess I can start asking questions on the forum because I'm just about stumped.
Meantime, when I've got a helper card in I can boot OSX from EFI but not from GRUB -- meaning I can't boot it 64-bit. Windows definitely seems more crash-prone when the helper card is in and DirectX is running. If I pop the helper card out, I can boot OSX from GRUB (either 32- or 64-bit) but it's unstable as hell that way and a significant number of programs just hang when I try to run them; for some reason I can't boot OSX from EFI without the helper card. (Even if I hold Option at boot, arrow over the correct number of spaces, and hit Enter to boot from the OSX drive, it doesn't.)
There are other bootloaders designed for OSX but none of them seem to be as well-documented for use on genuine Apple hardware as Chameleon.
It's a pain in the ass, is what it is. This is an impressive damn machine, but I sure can't see buying another Mac anytime soon.