ZodTTD has made his Genesis/Megadrive emulator for iPhone public. Genesis4iPhone was previously only available for beta-testers.

Release notes:

ZodTTD.com announces the public release of genesis4iphone v1.0.1. genesis4iphone is a Sega Genesis and Sega CD emulator for the Apple iPhone and iPod Touch.
It is currently available via Installer.app courtesy of the Community Sources at ModMyiFone.com. It is also available at the official ZodTTD.com repo. Manual downloads are being posted and will be available shortly.

I encourage everyone to join in on the forums here at ZodTTD.com and share your genesis4iphone experiences by heading to the newly created genesis4iphone section:

See ya there!