Toshiba Satellite P25-S507, Linux 2.6.1, XFree86 Version 4.3.0, Nvidia driver 5328 fails.
There are no unusual messages in the logs, so the driver doesn't seem to know that things are not working.
Here is a picture of what I see upon starting X:
JPEG of messed up screen
It's the NVIDIA logo screen.
4496 works well.
If I install 5328 and startx I get the screen in the picture. If I rmmod the 5328 driver and then insmod 4496 & startx again, I get the same messed up screen. I have to reboot in order for 4496 to again correctly work.
Here are some more details: