Just a cool tip I found to hide the user list on the logon screen. I have a great number of users, and the list was getting pretty ridiculous... This command will restart your xserver. Save your work beforehand.
**sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type Boolean --set /apps/gdm/simple-greeter/disableuserlist True
sudo /etc/init.d/gdm restart**
And that will give you a nice clean username/password box.
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