I remain intrigued by the concept of iPhone program development. I think that the iPhone has the potential to make a real impact in the portable gaming market (Touch Arcade is a good source for information about iPhone gaming). Plus, I think that the iPhone is a neat little device and the only cell phone design that has ever appealed to me.
Apple has a page devoted to their iPhone Developer Program, but you still need to sign up before they will tell you any details. Some are complaining about the restrictions Apple has put on native programs written for the iPhone but they don’t sound that limiting to me. I imagine that the more severe ones, such as restrictions on private API’s and open source software, will be eased over time.
I had read before that Apple intended to ban emulators on the iPhone, but I can’t find any official confirmation of that. Apparently there’s no blanket ban, at least according to this: StyleTap officially bringing Palm emulator to the iPhone / iPod touch.