Abstract: A computer-implemented method for use in conjunction with a computing device with a touch screen display comprises: detecting one or more finger contacts with the touch screen display, applying one or more heuristics to the one or more finger contacts to determine a command for the device, and processing the command. The one or more heuristics comprise: a heuristic for determining that the one or more finger contacts correspond to a one-dimensional vertical screen scrolling command, a heuristic for determining that the one or more finger contacts correspond to a two-dimensional screen translation command, and a heuristic for determining that the one or more finger contacts correspond to a command to transition from displaying a respective item in a set of items to displaying a next item in the set of items.

Abstract: A computer-implemented method, for use in conjunction with a portable electronic device with a touch screen display, comprises displaying at least a portion of a structured electronic document on the touch screen display, wherein the structured electronic document comprises a plurality of boxes of content, and detecting a first gesture at a location on the displayed portion of the structured electronic document. A first box in the plurality of boxes at the location of the first gesture is determined. The first box on the touch screen display is enlarged and substantially centered.

Abstract: A plurality of icons are displayed on a touch-sensitive display. A respective icon in at least a subset of the plurality of icons corresponds to two or more symbols. A contact by a user with the touch-sensitive display that corresponds to the respective icon is detected. A respective symbol in the two or more symbols to which the contact further corresponds is determined. The displayed respective icon is modified to indicate that the contact corresponds to the respective symbol.

Abstract: A plurality of icons are displayed on a touch-sensitive display. A respective icon in the plurality of icons corresponds to at least one symbol. An actual contact by a user with the touch-sensitive display is detected. An estimated contact that corresponds to the respective icon and at least the one symbol in accordance with the actual contact and a pre-determined offset is determined. A magnitude of the pre-determined offset corresponds to a difference between the actual contact and the estimated contact. One or more corrections for one or more errors in one or more selected symbols are received. The offset for at least the respective icon is modified in accordance with the one or more received corrections.