While sales of 1.7 million units in the first three days of availability are mighty impressive, the iPhone 4's 960-by-640-pixel screen resolution is even more impressive. No competitor has been able to stuff as many pixels into a 3.5-in. (9 cm) LCD. What's more, Apple's front-facing camera and FaceTime software have finally made mobile video chatting popular with regular people.
Price: $199 to $299.
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