I am running Debian 6.0 (Squeeze) and did an update today. Kernel is now at 2.6.32-5-686. Never had issues installing the nvidia driver before.
Heres the System:
Athlon64 4000 1MB
eVGA GeForce 6600
It errors out when building the kernel module, saying nvidia.ko cannot be loaded.
Heres the log file: http://ngzroot.ath.cx/nvlog.txt