I'm going to jump on the bandwagon...

The wallpaper is the skyline of Dayton, Ohio taken from the top deck of the WorkFlowOne/Deloitte Office Building parking garage.
My aunt had given me one of here season tickets for a Dayton Dragons (A Affiliate of the Cincinnati Reds) and it came with a free parking pass for this garage. The Dragons lost 21-10. I left in the 8th inning and snapped this pic on the way to my car.
Operating System: Ubuntu Lucid Lynx, with Avant Window Navigator and GNOME Window Manager.