Quentin Garnier has made a loadable kernel module (LKM) version of the NVidia drivers on NetBSD. This release is very preliminary, rough and mostly meant to test the installation procedure. You will need a NetBSD-current system but the code itself should be quite backward compatible with some caveats. For example, you need 'options KVM86' in your kernel config. Known working hardware includes RIVA TNT2 Model 64 (PCI), GeForce2 MX/MX 400, Vanta(AGP) and more!