To get best results in a complex rendering (especially if you are making a game), you should architect your rendering code to sort geometry based on rendering state, and not worry about front-to-back sorting as is typical on desktop systems.
From OpenGL and Mobile Devices: Round 2 at Dr.Dobbs Portal
If you would like to get started with game development using Open GL ES on the iPhone or the iPod Touch, this article at Dr.Dobbs Portal is a good start. Professor Richard S. Wright Jr. describes the iPhone software SDK, the hardware, Objective C and Cocoa, and how to deal with files and resources.
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