geohash.org popped up recently with a method of generating short hash codes for geographical locations. The codes have some interesting properties and the algorithm is documented on wikipedia.
I recently started doing a Project Euler problem a day as a fun diversion. I found the geohash algorithm intriguing, so it became my “Euler problem” for the day!
Having done it, I’m not sure I’ll find a use for it myself, but if anyone else finds it handy, do let me know!