Thank you A.Sokolowski (and Dragonmaster Lou)!

My video card only has a single DVI port, and I use a splitter to plug
in my monitors using two DVI cables. Therefore I modified your
suggestion slightly.

I put the following at the bottom of my /etc/profile:
xrandr --output DVI-0 --mode 1280x1024
xrandr --output DVI-1 --right-of DVI-0 --mode 1280x1024

I modified my xorg.conf like so:
Section "Screen"
        Identifier      "Default Screen"
        Device          "Failsafe Device"
        Monitor         "Failsafe Monitor"
        Defaultdepth    24
        SubSection "Display"
                Depth   24
                Virtual 2560    1024
                Modes           "[EMAIL PROTECTED]"  "[EMAIL PROTECTED]"
        EndSubSection
EndSection

After rebooting my machine dual monitors work perfectly.

A couple of notes:

* I had to reboot to get the new settings to take effect. Pressing
Ctrl+Alt+Backspace doesn't do it.

* The login screen still shows up on both monitors (it's "mirrored")
which could lead you to believe that the settings haven't taken effect.
However upon logging in I have one large desktop spread across both
monitors with the Ubuntu Panel on the right hand screen and my desktop
icons on the left. It doesn't parse /etc/profile until you log in.

* Modifying settings in "Screens and Graphics" takes me back to square
one, with my monitors mirrored. To get my dual monitor configuration
back I have to edit xorg.conf and reboot.

-- 
Dual Monitor Problems
https://bugs.launchpad.net/bugs/44708
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