Left 17" is connected to:
Athlon X2 5600 2gb DDR2 nVidia 7600gs running XP

Middle 19" and right 17" are connected to:
Athlon X2 6000 2gb DDR2 nVidia 7900gt (now running vista)

An interesting bit... the wallpaper is a screenshot of Dustwallow Marsh from the avatar of the guy who designed it's point of view...