iPhoneNES is a NES emulator for iPhones. NESApp seems to be iPhoneNES but updated more regularly on its primary homepage with the same authors etc. Changes since the earlier v0.31 release of iPhoneNES are:

Changes:

0.32 [nervegas] Added delete option for saved games
0.33 [nervegas] Fixes to orientation changes on select menus
0.34 [nervegas] Fixes to mapper4 restore state (fixes Super Mario 3, others)
0.35 [nervegas] Implemented swipe-to-delete for saved games
0.36 [nervegas] Minor UI Tweaks

Thanks to http://www.emuholic.com for the news.

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