Google Flight Simulator

As this blogger found out, the new Google Earth now contains a hidden flight simulator!
Click ctrl+alt+A (if you're running OS X it's command+option+A) and the following dialog pops up and asks you whether you want to fly an F-16 or an SR-72, which airport would you like to start in, and whether you'd like to use a joystick. And off you go!
Since they have the real satellite pictures, this, by far, beats the flight simulator in Excel.