This article is a facinating story about a would-be spy who used a GPSr to mark 19 buried caches containing classified secrets that he wanted to sell to Iraqi and Chinese embassy officials. He got caught because he was dyslexic and became known as "the spy who couldn't spell." The breaking of his secret code is a study in cryptanalysis. I loved the part about his "backup coords" that were contained in a toothbrush case he buried by a fence.

Tale of a Would-Be Spy, Buried Treasure, and Uncrackable Code

Hah, where do you come up with this stuff??