Combine GPS, the web, and cell phones and what do you get?  The ability to leave or pickup postit like messages out of "thin air."  Sort of like an invisible gps triggered text fart.  There are still some technology kinks to iron out before this fully catches on.  In the meantime play hide-and-seek with GPS's and geocaching, the sport of hiding or finding hidden stashes in obscure places using only GPS coordinates.

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