nervegas, author of NES.app, a very sweet and advanced NES emulator for iPhone’s is looking for help:

Call for Developers: I’ve been struggling to fix InfoNES’ broken PPU scrolling code. I’m looking for other developers with experience in NES emulation who would be willing to take a look at the code. Please contact me at nervegas(at)natetrue.com. I will be releasing a new project, NESCore, shortly, which is a portable NES emulation core (LGPL) based on pNESx, only with many fixes from the original code…

http://iphone.natetrue.com/nesapp/