I have had some people ask me how to quickly switch to a terminal from within Gnome and back again, well UBUNTU has a shortcut you can do this with F1-F6 will get you a terminal and F7 will return you to your X-server if you left it intact.
If for instance you are updating your graphics driver or anything and you need to Kill the X-server you can do so in UBUNTU by typing
sudo /etc/init.d/gdm stop
Also another neat thing some people don't know about the terminal in Linux is when you are typing in a file name if you are in the right directory and type the first letter of the word and click Tab it will appear remember Linux is case sensitive as well. Some times it will also give you a lot of choices as well.
