So, after so many complaints about windows still not fitting in 1440x900 resolution, which it's supposed to fit into, I did some testing.
THE TASKBAR IS IN THE WAY!
The windows are the exact size of the display, but the taskbar SUBTRACTS space from the available pixels, it's not EXTRA pixels on top of that 1440x900 resolution.
I'm willing to bet my hat that Steve auto-hides his taskbar... and if you set yours to auto-hide your taskbar, your windows should fit too!