It very well could be a combination of the new nForce drivers and my specific motherboard (Asus A8N-VM S939). I have no other nForce4 systems to test it on, and I've talked to other people who've had problems with the nForce4 chipset and Linux, so I assumed that it was fairly universal.
This is not to say that Linux absolutely failed to install. After a lot of effort I finally got Debian installed with all the proper nVidia crap, but whenever I would start X after a few moments it would freeze. This happened whether I used the "nvidia" graphics driver or just "nv" so I assumed it wasn't my graphics card (GT6600).
I should also note that my processor is an Athlon64 and I'm using the 64 bit versions of anything I can. This could also be a factor.
In any case, I didn't know enough about it to fault Frugalware for not installing. So I chose instead to use VMware. I thought that would be the more fair option.