Hot on the heels of the iPad launch, Steve Jobs took to the stage once again to pull back the curtain on the iPhone 4.0 OS. Like the previous major OS upgrade, this one contains more than 100 new user features, including multi-tasking, music playlist creation, and support for Bluetooth keyboards.
Apple also revealed iAd, an advertising platform designed for the iPhone using the HTML5 standard. Developers can embed iAd into their apps and Apple will split revenues ad revenues with them. Game Center -- a social-gaming network -- allows users to play games online.