Iphone Apps Development Costs

What do I need to begin creating applications for the iPhone?

What I'm after any list is useful or any other useful information I can use to determine the initial costs of initial development – Thanks

An Intel Mac with Mac OS X 10.5 or later, the latest tools and Xcode Apple iPhone SDK (free), an iPhone or iPod Touch. To publish apps you need to pay a fee of $ 99 annual developer for Apple.

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