setup:
i use 1280x1024 on my TFT (panel sits here; screen0)
i use 1280x960 on my CRT (taskbar sits here; screen1)

problem:
when i maximize a window on the CRT, it maximizes below the taskbar (window
maximizes too much). like Xfce thinks that the screen res. is at 1280x1024 on
both screens.

i solved this by using the same res. on both screens. but it would be better to
have a 1280x960 res. on my CRT because its not squeezed.

system info:
xorg 6.7.0 with ati drivers and xinerama (radeon 9800pro dual head)