Ug. Darn modules... After forcing it to load with 'insmod -f NVdriver', it squaked about licensing and gcc, then it finally loaded. I doubt the module will load on its own if I ever reboot my machine again, but atleast I know the workaround now.
The error just seemed to glaringly point in gcc's direction as the root of the problem. Odd.
% cat /proc/driver/nvidia/version
NVRM version: NVIDIA NVdriver Kernel Module 1.0-2960 Tue May 14 07:41:42 PDT 2002
GCC version: gcc version 3.2 (Red Hat Linux Rawhide 3.2-1)