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But you definitely don't use more than one monitor. Because this bug is confirmed since 5 years for Multimonitor setups.
Multiple monitors on the same video card are hit and miss.
Multiple monitors over multiple video cards hasn't worked properly with most Linux desktops in years.
(For example, just install >1 video card, hook up a monitor to it, and even if xorg.conf is properly configured, it won't appear in Gnome / KDE GUI's to position monitors. Icon dragging between different X screens is a no go although it worked in CentOS 5.8.)
If you are putting in the effort to deal with multiple monitors, please consider the case of multiple video cards. (4 video cards X 6 monitors = 24 monitors is a reality in terms of hardware, it needs to be a reality in terms of software as well.)
Except for some of the display options it looks like Gnomes setup.
You drag the monitors around so that they match their physical configuration and you can set things like primary monitor, resolution, etc. Also, it saves the setups so that when it detects those inputs again it automatically uses the setup you used previously.
This program is included in the Fedora 19 Beta, if you use KDE as your desktop. It looks like multiple video cards and multiple monitors is working with it using the nouveau driver. Seems to work perfectly so far...