What happened to double-click home button shortcuts in iOS 4 (camera / favorites)?
The option under Settings -> General -> Home to add shortcuts to the home button has been removed in iOS 4 (iPhone OS 4). Double clicking the home button now opens the multitasking bar.
Users previously had the option to directly access iPod, Camera, Phone Favorites or Search by clicking the home button twice.
Triple-click options for the iPhone home button can be set under Settings -> General -> Accessibility and include features such as Zoom, Large Text, and White on Black.