It must be an April fools thing, but I reckon it would be useful for gaming (however long it lasts for):
Go into google maps, and the Map button toggles to "Treasure"
So I reckon you should get in and grab your favourite locale and "Treasure" map it for future gaming uses :)
I screencapped a location nearby that wouldn't be too bad to use for a game map.
(http://www.somewords.net/images/Google_treasure_map_iluka.JPG)
That's really cool -- I hope it sticks around a bit, I'd like to get some use for it in my Werewolf game.
Type in a street address and go to street view.
That is fun, they should make it a permanent feature in the background and put in some more details.