iPhone app development is not a “somebody’s else” ability. You can also develop iPhone application may be from smaller, to start, to moderately bigger application.
When you say,
“I know Object C”
Okay, you are the master, you can use iPhone SDK from Apple to develop your applications.
“I know Flex”
If you know Flex, download latest Flash Builder from Adobe working with Air 3 SDK. You can simple develop mobile applications for iPhone and Android. It is easy to develop, debug and install on your device.
“I don’t know Flex, but I know Flash + Action Script”
Yo, you are the Man, You can develop your SWF file in flash and can convert to an iPhone app using Flash Builder (with Flex). So simple as that
“Oops, I don’t know Flash either, but I know HTML and Javascript”
Cool, you can also develop iPhone application. Go to PhoneGap website and download their SDK. Here you can develop all the screens using HTML + CSS and all the actions can be done in Javascript.
“But I am not good in Javascript, I know jQuery”
Download jQTouch plugin for PhoneGap and start using jQuery with your HTML.
So, start updating your Resume/CV today, with : “Experienced in iPhone Application Development” 
Enjoy coding …
