Few feature requests :)
I want to see nvidia-settings gettextized, so I (and other ppl) can make messages translations for your great proggie. Maybe you should also autotoolize them?
And BTW, I don't think there's need to ask user if he/she really wants to quit.
And your program should have a GNOME/KDE menu entry. I wrote a simple .desktop file for Debian+GNOME and included an icon from nVidia desktop icon theme for Windoze (is that okay?), but I think you should provide your own .desktop and icon.
Also, as others alreasy said, we need to easily configure twinview, SBA, fastwrites and other stuff.
Sorry for my english