Following on from Google's spelling challenge game released in May called Spell Up the folks at Mountain view have again beefed up their educational profile with the addition of an excellent little Geography / General knowledge game called Smarty Pins.
The premise of this game is simple, you have to correctly locate as many geographical icons on a map using the clues provided in as little time as possible. The closer you are the more questions you will continue to face. It's great fun and very easy to play.
The feedback from an incorrect answer is pretty amusing. It tries to belittle you as much as possible without killing the friendship entirely.
I am not sure how deep you can go with this as far as using it as a Geography tool for learning and teaching but it will definitely separate your students who understand that Austria and Australia are two countries that have very little in common.
Finally, it is regionally sensitive and as such will ask you questions primarily aimed at the country / region in which you live.