Recently Steve Jobs said that the IPhone and IPod touch "are a great gaming platform". I'm sure that both products have the "horsepower" for playing 3d games, but I couldn't play an action game (or sport) of an IPod or worse on an IPhone.
Why?
Easy: "the missing controller". I'm a fan of accelerometers (and an happy Wii owner) but the IPod have no buttons, and interaction with games it's often done with button simulated on the touch screen.
During frenetic playing session it happens to press the buttons with an higher pressure that you would like, and I'm not sure that the IPod display could sustain the same amount of pressure the button of a PSP or NDS can.
So if we are speaking of ability games, puzzles, management, turn based rpgs, or other "relaxing" games, I'm sure that the ipod can provide a gaming experience even better than both the NDS and PSP, but IMHO for action based games the risk of shattering the display it's too high for really enjoying the game.
This is, of course, my personal opinion, and I do not own an IPod (but I had the chance to play with one for a while), I just wanted to point a possible weakness of the platform.
Bye
