I've been doing some more testing on the Dell D420 referred to in #14.
If I boot with the 2nd monitor connected, the system starts with the displayed 
mirrored.
I can then use system / preferences / display to make the displays different.
If I unplug the monitor, I can use system / preferences / display to reset it 
back to a single display and it works.
If I then plug-in the monitor again, the display hangs in the same way as if 
the laptop was booted without a second display connected. Both primary and 
secondary screens are blank except for a stationary cursor on the secondary 
monitor.

If I switch to metacity as described in this thread, dual screens just
work.

-- 
[i945gm] [karmic] X servers hangs when settings up dual monitor config
https://bugs.launchpad.net/bugs/438000
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