I'm also for a NetBSD driver.
If someone from NVidia reads this:
You only need to port the kernel module and recompile the XServer-Modul. That way, you will get a few thousand new customers. Same for OpenBSD. I'm sure that most of the NetBSD users will buy an NVidia card if you are faster releasing one than ATI. It's very likely that the ATI drivers are running soon on NetBSD and a little later on OpenBSD, too (I guess OpenBSD will port DRI from NetBSD). Adding the number of users of NetBSD and OpenBSD, then it's a few hundred thousands. If only 10% buy a good NVidia card, for example one of the 6800 series, than wouldn't that be worth it?