Battleship: Google Earth
Image by JulianBleecker
Load this URL into your Google Earth client (Add->Network Link).
(Warning: The Battleship Sketchup Model takes several moments to load, but only loads once. The Google Earth view updates every so often to refresh the game board in case new pegs have been dropped.)
The old Milton Bradley Battleship game. Hunt for the Battleship by walking in the normal human world, using a GPS connected to a cell phone and calling into the game engine to "drop" pegs or "ping."
More notes are on the laboratory blog.