NVidia 8800GT

Stop X:

sudo /etc/init.d/gdm stop

Install stuff:

sudo apt-get install pkg-config xserver-xorg-dev build-essential
sudo apt-get --purge remove nvidia-glx nvidia-settings nvidia-kernel-common
wget http://us.download.nvidia.com/XFree86/Linux-x86/169.07/NVIDIA-Linux-x86-169.07-pkg1.run

Run the nvidia driver installer:

sudo sh ./NVIDIA-Linux-x86-169.04-pkg1.run

Follow the instructions and get it to configure X for you. Finally, a tweak:

sudo vi /etc/modeprobe.d/lrm-video

Comment out the line:

install nvidia /sbin/lrm-video nvidia $CMDLINE_OPTS"

Cross fingers and start X:

sudo /etc/init.d/gdm start