1. A multifunction device, comprising: a touch-sensitive display; one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: displaying a first application view on the touch-sensitive display that corresponds to a first application in a plurality of concurrently open applications, wherein the first application view is displayed without concurrently displaying an application view for any other application in the plurality of concurrently open applications; while displaying the first application view, detecting a first predefined input; in response to detecting the first predefined input: entering an application view selection mode for selecting one of the concurrently open applications for display of a corresponding application view; displaying in a first predefined area of the touch-sensitive display a group of open application icons that correspond to at least some of the plurality of concurrently open applications, the open application icons in the group being displayed in accordance with a predetermined sequence of the open applications; and concurrently displaying at least a portion of the first application view with the first predefined area; while displaying the first application view without concurrently displaying an application view for any other application in the plurality of concurrently open applications, detecting a first gesture of a first gesture type on the first application view, on the touch-sensitive display, the first gesture being distinct from the first predefined input; and in response to detecting the first gesture of the first gesture type, displaying a second application view on the touch-sensitive display that corresponds to a second application in the plurality of concurrently open applications, the second application being adjacent to the first application in the predetermined sequence, wherein the second application view is displayed without concurrently displaying an application view for any other application in the plurality of concurrently open applications.