See also BinaryDriverHowto - install support for your new ATI or NVIDIA graphics card
Radeon 9200/9250 (RV280) and DVI - How to get DVI output working with ATI RV280 series video cards?
Nvidia Driver - How to install the both the latest driver and the one in the repositories (it also includes a detailed Problems Section)
Nvidia Troubleshooting - How to solve OpenGL Problems with Nvidia Drivers
Nvidia TV Out - View X simultaneously on your monitor and TV
Nvidia manual drivers installation - How to install the Nvidia accelerated drivers without apt
i915G video cards - 845G/855G/865G/915G/945G chipset installation workaround on Breezy preview
Video/IntelVideoOnGigabyteGA8i865gme775Fix - Gigabyte GA-8I865GME-775 motherboard with builtin Intel video card and BIOS version F2 (or lower?) causes "Signal over range!" messages when changing screen resolutions (e.g. playing Super Tux).
Webcam - Guides on installing and managing Webcams.
Firewire - Hardware, drivers and software for getting ieee1394 (Firewire) to work
Asus_P7131_Dual - Help on installing an Asus P7131 dual DVB card.
VMware-Xorg-7 - Help solving issues after upgrading to 6.10 Edgy.