Update: InfoNES v0.94J for PSP r0.2 has now been released, along with a few customized versions of InfoNES titled FamiContest v0.1 and FamiContest v0.2 (adds auto-framerate skip & slightly improved sound) which both have a ROM File Selector built-in as well.
Today the Nintendo emulator InfoNES v0.94J for PSP r0.1 has been released for v1.00 firmware PSP users! Although sound isn't included yet, future releases are due to include it soon the author states as well as operability optimization. For usage, copy the EBOOT.PBP to /PSP/GAME and ensure the uncompressed ROMs 64k rank are made the upper limit. Operation method: B- X Button, A- O button.