This is probably the best way for anyone to add software to their iPhone. AppTapp handles the entire process, you just plug in your iPhone, and it does the rest. It adds an Installer application item to your iPhone’s home screen. From there, applications are downloaded, and installed, all over Wi-Fi. Quite simply, it just works.
In addition, Gizmodo has posted an additional guide for using AppTapp to install the latest NES emulator and ROMs, for full game playing… on your iPhone.