Here is a new web-based Google Maps game called "Brewster Jennings Protects America: The global spy hunt game". It's based on the same concept as the educational PC game "Where in the World is Carmen Sandiego?" and puts you on a timed mission to find US locations on a Google Map based on the clues that are given.
..Keep track of the changes and developments for this game with the Brewster Jennings blog.
This is just one of many Google Maps games that have been developed for web-gamers. Other good titles include: