One change, using "sudo aticonfig --xinerama=on" causes the xserver to crash when completing the boot. Unlike most cases, I can't identify the cause in my X log file. The xorg.conf works fine when I run "sudo aticonfig --xinerama=off" (of course, one of the monitors sits black in this case though), and my exact xorg.conf file from Lucid (which worked with xinerama and both monitors) also crashes now with Meerkat.
Link to Xorg.0.log
Link to xorg.conf
Could it be a KDE problem? Not sure, it's strange because both monitors look good while the pretty KDE boot screen is being shown on the left monitor, and it's not until KDE is finishing booting and about to normally display the desktop that it crashes.
XRandR1.2 problem? I've heard people having trouble with this, so I tried two things:
adding to xorg.conf device section
Option "EnableRandR12" "false"
In the section labeled [AMDPCSROOT/SYSTEM/DDX]
Neither of these seemed to fix the problem.
Any help is greatly appreciated!