extended dual screen xorg.conf error debian lenny

This is the error is get on my dual screen set-up This maybe due to the apple firmware playing silly buggers or some error in my xorg.conf. Or a bug. As I only needed dual monitors to set-up the LCD conversion I don't care :) It would be nice if it was perfect though, but the machine is used as a media centre (I have no TV) but watch allot of films. This set-up means I can connect my VHS player, DVD's, xvid's as well as HD and networked movies. All played through my big Yamaha amp, Nice.