Yellow spots or discolored screens on the new iPhone 4 are being reported before the device is officially available in stores.
An iPhone 3GS owner in France has reported that white iPhone discoloration is being caused by cases and not the battery as many had suspected.
Various sources on the Internet are reporting that the white version of the iPhone 3GS is overheating and turning brown or pink.
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MacBook (#6): More on case discoloration, protectant
MacBook (#7): Heat issues -- is it a laptop?; More on case discoloration -- removing the stains; more
MacBook (#5): Discoloration on case; Reminder: Check your MacBook's rear vent