there is a new unofficial version of AntSnes, a Super Nintendo emulator. The main developer promised to update it with better buttons. The link to the file is at the bottom of this post and the file itself is included also. You don't need a hacked phone to install this EMU, it is already signed by the author and it supports multitouch and has full set of on-screen buttons. Also runs much faster, close to 60 FPS w/out sound and usable with it
The author has this to say about the "Requirements: S^3 device with Qt 4.7.2 or 4.7.3 libraries installed"
To play a "Public Domain" "PD" demo or game you will need a rom file unzipped wherever you want, the files are usually called *.smc . You will be presented with a file chooser as soon as you press load rom in the EMU
http://www.summeli.fi/?p=2314