Apple Announces iPhone 4

In a keynote presentation today at WWDC, Steve Jobs officially unveiled the iPhone 4. It's powered by an A4 chip, has a glass front and back, and has stainless steel around the edges, which turns out to be part of the antenna system. The new iPhone uses what Jobs called a "Retina display," running at 960x640, or 326 ppi. The battery is also bigger, with a corresponding increase in battery life.