Where the words are one tall drink of water.

When upgrading to Ubuntu 9.10 (Karmic Koala) I ran in to an issue where GDM began displaying the local user names at the login screen. To maintain a bit more privacy and security I wanted to disable it. It took me a few attempts, but I finally found a command to correct this:
sudo -u gdm gconftool-2 --set --type boolean /apps/gdm/simple-greeter/disable_user_list true

Unfortunately, I don’t have the original link I found the command from (typing in the command above returns a lot of results), but thank you whoever you were!