Google Earth, the program you install on your computer to explore the earth, has a nice little "easter egg" built in : A fully working flightsimulator. The game was first discovered by a blogger from South Africa, who immediately revealed the game on his blog.
Just as he says on his blog, Google is wellknown for releasing data without ever saying a word about it. Apparently he was unable to find anything about the hidden game in Google Earth.

It's not in the release notes and a search on Google produces no results. Seems Google have done one of their unpublicised updates they're becoming well-known for.

The game exists only in the latest version of Google Earth. On a mac, press control+a to start the game. On windows you can start it by typing Ctrl+Alt+A.

I wonder what else Google has hidden in unexpected places....