Flight simulator in the new Google Earth
Start Google Earth and push the Ctrl+Alt+A combination to start the simulation. After the first flight you can start the program from the menu as well.
Look at me flying above Auckland.

Auckland from a different view with more 3D buildings:

Here is me flying over New York with 3D buildings enabled (I also downloaded the WTC:

And this is above (or around) the Grand Canyon, USA

Take off from Katmandu (default airport) and discover the world from above or start from the current view already in the sky.
Easter egg or a new feature? Probably a new feature, because it has a user guide here.
You can choose between two planes: F-16 or SR-22. Enjoy!
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Comment by sbiddle, on 2-Sep-2007 15:56 , user id: 1387)
Have you played with any of the cities that have full 3D content?
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Comment by paradoxsm, on 2-Sep-2007 13:15 , user id: 8664)
OMG!!! now that's cool..
Now we have to figure out how to use the API and add our own planes and cool stuff!
Time to dust of the old joystick and flight yokes.