Traditionally, a pilot's priorities are: aviate, navigate, communicate.
But that might not be true for X-Plane for the iPhone.
It's real! And it pretty much is X-Plane - there really are OBJs and DSFs in there, as well as an ACF model, all tuned for the iPhone.
In the next few posts I'll blog a little bit about the impact of doing an iPhone port on scenery development. The iPhone is an embedded device; if you go digging for system specs you'll see that it's a very different beast from the desktop. The porting process really helped me understand the problems of the rendering engine a lot better, and some of the techniques we developed for the iPhone are proving useful for desktop machines as well.