There are some interesting numbers in here, including the number of video
cards by brand, and the driver used.
Hightlights for me:
* More people use nvidia hardware than any other brand
* More people are using the open source ATI driver than AMD's catalyst driver
* There is little use of nouveau
* Most people get their drivers from their distro
* Multiple display heads is the most common display feature used, although
* The vast majority of people use one display
* 65% of people responding use compositing, with 37% using Compiz
(I wish this were broken down by graphics card hardware vendor)