I am a long time Fedora fan. Last week, I couldn’t resist dire to try Ubuntu 10.10. After installed a desktop using Ubuntu live CD. It’s a relatively easy ride, but the desktop is a bit annoying. 
It’s a big headache when I tried dual monitors. The desktop got a searing screens. I can’t find a way to restart X windows without reboot. the Fedora way (init 3; init 5) won’t work
Finallly, got a few fix.
Restart X windows without reboot
start a terminal with Ctrl+Alt+F1,
login as root or using sudo
/etc/init.d/gdm restart
Use dual monitors
login ubuntu classic without effect
get monitor configuration