After installing the nVidia drivers in Ubuntu 6.10 the screen was pushed slightly to the left. It was enough to be annoying, and since I didn’t want to shift the monitor settings (as I run windows as well) I ran the utility xvidtune from the terminal, pushed the “right” button about 6 times to move the screen to the right, hit show, got the modeline from the terminal output, and inserted that into the Monitor section of my /etc/X11/xorg.conf file (after backing it up!) with the prefix Modeline. All better now!