im sure you guys stopped caring by now
but.....
i just put an NES emulator on my iPhone [lower left icon]
YouTube - iPhone NES demo
its still an early version of the program, so its about as reliable as your NES, so the controls are kinda weak, and theres no sound yet, but it is any NES ROM you can find on the web on your iPhone.
more systems in the works too (sega?)