A developer called "TehDiplomat" has created a risk game out of the Google Maps API.
For some reason I decided a bit after the API for Google Maps came out that it would be awesome to be able to play Risk on it. About a month later it became apparent that everyone using the API was doing it for more useful things, such as gas price tracking and ::cough:: hotornot placement. I've always been a gamer and thought this was the perfect step.
It's a bit clunky right now, but it works and is another interesting use of the Google Maps API.