1. A method comprising: at a portable electronic device with a touch-sensitive display: concurrently displaying a first region and a second region in an application menu user interface on the touch-sensitive display, the first region configured to display multiple pages of application icons, the first region displaying a first page of application icons in the multiple pages of application icons, the first page of application icons including a first application icon at a first location, the second region comprising a tray, dock, or menu bar with a set of icons between the first region and the bottom of the touch-sensitive display; while concurrently displaying the first region and the second region in the application menu user interface on the touch-sensitive display: receiving a touch input by a single finger contact on the first application icon in the first page of application icons, the touch input specifying selection of the first application icon; responsive to the touch input by the single finger contact on the first application icon in the first page of application icons specifying selection of the first application icon, modifying the visual appearance of the first application icon; receiving a dragging touch input by the single finger contact without breaking contact with the touch-sensitive display, the dragging touch input removing the first application icon from the first location and moving the first application icon to within proximity of an edge of the touch-sensitive display; responsive to the dragging touch input moving the first application icon to within proximity of the edge of the touch-sensitive display, replacing display of the first page of application icons with display of a second page of application icons in the multiple pages of application icons in the first region of the application menu user interface and maintaining display of the second region between the first region and the bottom of the touch-sensitive display; receiving a dragging touch input by the single finger contact without breaking contact with the touch-sensitive display that moves the first application icon within the second page of application icons; and responsive to the dragging touch input by the single finger contact that moves the first application icon within the second page of application icons, positioning the first application icon within the second page of application icons.