The colors pop. Pleasantly, but almost unnaturally, super saturated and contrasty, the kind of processing I love in Nikons, taken to the extreme. That's the iPhone 4's secret sauce. Color and contrast. Apple's not going for accuracy, they're going for your eyeballs. Look at the fruit captured by the iPhone compared to the S90—the latter's photo is far more natural, but I want to make lemonade with the lemons in the iPhone's photo. When I touch up photos, manually, that's about what I do to them anyway.