I also had the problem of the permission not staying permantently set. The suggestion in the readme file didn't help. What you need to do is edit the file:
and make the nvidia line look like this:
The driver works great for me by the way (Dell GX280, 6600GT, HP L2335 monitor via DVI-D, Fedore Core 3, 2.6.9-1.667).
Originally Posted by johnschipper
When booting I believe udev has a file
/etc/udev/permissions.d that contains the permissions to use when creating the /dev/nvidia* files dynamicly. Not sure if this will help you but take a look at the nvidia* permissions in this file.