...and 1,174 users want to know why:
...and this guy at O'Reilly seems pretty biffed too (for over a year now!):
Debian, Gentoo, YellowDog and other PPC Linux users are unable to get the nVidia drivers working. I'm not a hardware guru, but I think one solution to this problem may be to compile the x86 Linux drivers on a PPC machine. I hear a lot of Linux users suggest people purchase graphics hardware from vendors other than nVidia, since those other vendors graphics hardware is better supported on Linux.