You've got to hand it to the boys at NES.app, they really work hard in giving everyone a fool-proof and up-to-date version of their NES emulator for the iPhone. With the advent of the new iPod series, we might be seeing this little application on it sooner or later.

Until then though, developers nervegas and jordan have cleaned up several flags in the application as well as compensated for some overclocking instances. They've also finally managed to add support for a second player controller. Here's the complete list of the changelog for the current build for NES.app v1.4.0:

1.4.0    
[nervegas]

• Added HSyncs for overclocked situations (DMA, etc)
• Added 512 clocks for DMA writes
• Fixed vblank flag (set @ 240), rolling thunder levels fix
• Fixed vblank end = scanline 261 (0-indexed)
• Added support for player 2 controller (touch top gray bar)

[jordan]   

• Added 8-step CPU cycle between IRQ and NMI
• Moved CPU step to before sprite hit, fixed minor rendering

[nervegas]

• Added "mid-button hot spot" allowing both A/B to be pressed by rolling the thumb from one button to the middle of both.

Download: NES.app v1.4.0