Take a huge boeing 737 airplane, remove the cockpit, add a robot brain and some reconnaissance gear and what do you get? You get a Global Hawk! The maker of Global Hawk Northrup Grumman has already made some for the US Air Force who already uses them, but now UPI informs us that they'll be making some for Austrailia too. Another article here. Global Hawk will taxi and take off and fly autonomously from Edwards Airforce base and then patrol Austrailia's shorelines without a pilot. Global Hawk can fly up to 65,000 feet and can stay aloft for up to 30 hours scanning bunches of stuff with it's sensor array.

You can read more about Global Hawk here, here and here and even about one that crashed. You can also see some more photos of Global Hawk here, here, here, here, here and here.