It's the dream of many N-Gage owners : a SNES emulator, with sound, savegames and zip support.
As for now, speed should be enhanced and special chips (like the superFX for StarFox) are not supported, but most of the games work very fine (except for the speed as said above, although it is quite playable). Thus, I've tried Super Mario All Stars, F-Zero, Zelda, Camel Try, ... and they all work !!
This emulator will soon be a must have (some will say it is already one

The full version costs about 20$, but you can try it with a limited demo that you can download here :
http://www.vampent.com/vsun.htm