Robert Broglia, the developer behind the free Snes9x EX jailbreak app, and a number of other commercial '.emu' emulators for other consoles, just released Snes9x Ex+. Broglia's latest branch of his popular iOS Super Nintendo emulator is based off of Snes9x version 1.53, which is the most recent available build of the PC software.
The more recent v1.53 codebase should provide near-complete emulation for a number of games, especially those that make heavy use of mode7 scaling or the Super FX co-processor...