The iphone? For gaming? Hahaha! Your kidding right?
Yes. The iPhone has tons of games. Some of them better than those crappy DS games. It is pretty hard to find an original, good game on the DS.
Monkey Ball with guiding the ball with a pen?
Monkey Ball with tilting the ball with a frikin accelerometer? <-- i vote this one
But how much money did you spend on this DSI? If it was more than 30 above the price of the original DS/DS lite, then it wasnt worth it