It's official: Multitasking is finally coming to the iPhone with an upcoming firmware update -- and therefore to the iPad and iPod touch as well. Speaking at their scheduled iPhone OS 4.0 event this morning, Apple's CEO Steve Jobs For users, multitasking will reportedly work transparently and fast -- simply double-click the home button and a tray showing all running applications will open. The functionality was highlighted by Apple's chief executive as just one of the top seven "tent pole" features of the new release, along with hundreds of other user features and 1,500 new APIs for developers to leverage in their apps. Multitasking will work only in the iPhone 3GS, iPad and third-gen iPod touch.