iOS 4 arrives, bringing changes with it.

"How will iOS 4 alter the current landscape? Here's what we know: The new OS includes 100 new features and 1,500 new APIs, highlighted by the introduction of multitasking, folders, a unified inbox and expanded search options. iPhone 4 itself boasts Apple's new FaceTime video calling solution, HD video recording, support for iBooks and a three-axis gyro that should herald significant strides in mobile gaming."