Apple ipod

iPhone and iPod Touch application development?

Hello everyone. I want to apply (PPP) for the iPhone and iPod Touch. All First, let's find some things in place. I know it must be a member of the evolution of Apple. I also know that this is not as easy as it seems and there are plenty of scripts coding and participate, with the tests. I want to know if I am an application and put it on my devices, it is still illegal? I also want to know if there are good tutorials this issue and what the major scripting languages you could expect help?

Apple water board if you do something like that.

Xcode Tutorial: Hello World iPhone App