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by Moto7451 4716 days ago
It's already at three versions of many images if you're still supporting the iPhone 3G in addition to the Retina 3.5 and 4 inch screens.

Where possible I've moved my artwork flow from using PNGs for everything to translating PSD files into stretchable image slices and custom UIViews crafted in IB/Objective C via Core Image & Core Graphics. It's more time consuming at first but pays off in the end.