I just added a 2nd monitor and I ran into that oh so typical issue where the monitors are swapped.
Apparently, the 2nd monitor has been identified as "monitor 0" by X.org, but it's # 2 according to the ATI configuration applet. (The applet numbers the monitors starting with 1, not 0.) That said, this 2nd monitor is the first one listed by the applet.
This concerns me, as I have run into issues on Windows with dual-monitors swapping randomly after reboots. Moving the Gnome panels over was easy enough, if not exactly obvious. However, I wonder about the possibility of other things using "monitor 0" when, in this case, I would expect them on "monitor 1."
So, can I control which monitor is considered primary?