Have you tried
http://www.wowinterface.com/forums/s...ad.php?t=32257 ?
Don't think the viewport command will do any good here, as the it only moves it up, not sideways right?
*note that Eyefinity makes 1 big screen, not 2 x 1 screen, the game (neither the OS kinda) is "aware" there are 2 monitors.