Valves Hardware survey

Valve just released their popular Survey Summary Data from November 13th, 2007 - May 15 2008

Here is one interesting bit of info

Windows Version

Code:

Windows XP                      1,398,776        80.92 %
Windows Vista                     258,612        14.96 %
Windows Vista 64 bit               45,787         2.65 %
Windows 2003 64 bit                12,219         0.71 %
Windows 2000                       10,607         0.61 %
Other                               2,617         0.15 %

Head on over to Valve's Survey summary page to view more interesting facts on what people are using to play Valve games.