via http://www.aep-emu.de/

Marat Fayzullin has ported his (commercial) NES emulator iNES to the Android platform: iNES for Android

Quote:
New in 3.6.17:
Made user-assigned key mappings override default key mappings.
Xperia Play [X] button now acts as FIRE-A (was START before).
Added persistent fast-forwarding option.
Added low disk space warning.