I know, i know: Whats wrong with NesterJ? Nothing Really, i just thought this was kinda cool, This is an oldish NES emulator for the PSX and i can confirm personally that it works! Although it emulates nes with full speed and sound when using the D-Pad in the menu, be very patient, it takes five seconds approximately to respond to Button push, but thats only in the menu .
When injecting your roms remember to set the region as USA as that is NTSC and compatible with POPS.
Then use the generated ISO with PSX2PSP 0.7 (just updated by KingSquitter, no its not the crappy one released before his one) and your set!