NoName has updated his Nes Emulator for the GP2X, heres whats new:
Changed codebase to FCEU 0.75 (Since it's about 3 times faster internally)
Sound works (although it's quite choppy atm.)
Rewrote the input so that diagonal controls work on the gp2x
Removed the happy hack screen blitting
Download here --> http://gp2x-emulation.dcemu.co.uk/fceultragp2x.shtml