Time will tell if the idea will take off, but I think the universal addressing/mapping system created by what3words is really fascinating.
The idea is simple and elegant - the world is divided into 3m x 3m squares, and each square is given a three-word code to describe it.
This makes addresses easier to remember than a latitude/longitude and more precise than a normal street address. Much of the world has no street addresses at all, and even in developed countries, street addresses are unreliable outside of urban areas, and not particularly precise inside of them.
The address of our main office is:
173 Owosso Ave
Fairlawn, OH 44333-3724
But the corresponding what3words address would be:
dormant.uprooting.premiums
Which not only directs to the office, but directly to the front door. With a 3m grid, you can actually specify particular doors or entrances.
Our old office was a multi-unit building, and edges.breed.icon would have taken you straight to the front door.
I'm really impressed at the level of thought that's gone into the system - addresses are available in multiple languages, using simple words, with more common or shorter words in areas with higher populations. Addresses with similar word combinations are intentionally far away from each other.
You can use the web map to find the address for any location:
https://map.what3words.com/