In the old days, I used to be very afraid of breaking my xorg.conf. Ubuntu Gutsy has done away with this fear, as repairing a broken xorg.conf is dead simple!
Option 1:
Allow Ubuntu to boot into Bullet-Proof-X mode (which is a failsafe mode like Windows Safe Mode). Using the familiar graphical user interface, run this command and follow the simple instructions:
sudo dpkg-reconfigure xserver-xorgOption 2:
Choose “Rescue Mode” on boot up. When you get to the command prompt, run the same command and following the instructions:
sudo dpkg-reconfigure xserver-xorgNow reboot and enjoy a working X again.
P.S. Since Ubuntu aims to never throw people to the command line with the implementation of Bullet-Proof-X, there should be GUI interfaces/wizards for repairing xorg.conf. Just a GUI button/menu entry for launching dpkg-reconfigure would be great. Then again, newbies shouldn’t ever break their xorg.conf. 
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It doesn’t say so on their website, but I’m pretty sure File Destructor is not responsible for any consequences from using the tool (like getting kicked out of school or fired from your job O_o).
