Just submitted to the app store and available soon: my latest iPad game Touch Flags. It is a flag pop quiz, with amazingly realistic multi touch interaction. You can drag, pinch, stretch, flip, fold and swirl the flags. It's so realistic, you can almost feel the cloth.
A nice thing about this puzzle game is that it is highly educational. Playing a few games will quickly give you expert knowledge on the flags of the world.
I am really proud of this game, I think it's a killer application of the 10 finger multitouch functionality of the iPad.