I just finnished tweaking my xorg.conf file to accommodate 5 monitors out of 6. I plan on adding the 6th monitor but have run into the problem with the login screen. I have all the monitors set up with the right modes and bit depth and have added the Xinerama option. It all works fine as for screen resolution and the order I want them in. The only problem right now is with the login screen not showing up.
Here is my xorg.conf file if it helps http://d3rr4l.pastebin.ca/16203