The removement of the class simple API from Greg K-Hīs  driver tree [ will be soon in vanilla also ] renders nvidia driver interaction with udev useless on 2.6.12-rc1-mm3 or higher mm kernels.
DONīT patch your driver for other kernels or if your dev isn't udev managed.
To get rid of manual device creation after each startup patch your kernel tree [ patch 1 ] and your driver tree [ patch 2 ]
Read the Patch headers for more details.
[ and excuse my bad english ]