So you will now be able to play Super Mario Bros. on your iPhone. I don’t know why you would want to, the input for the iPhone doesn’t exactly lend itself nicely to a regular platformer game. When playing the game you have a touchscreen controller, seems to me you would be a little clumsy playing this way.
“Presently there is no sound, and the emulator is a little slow (most likely due to the way I’m drawing onto the screen). And the control is a bit iffy (using an image of an actual controller, while cute, sucks).”
Here is a video of the emulator with links underneath.
Update: The application has been updated to speed it up and is available at the link above