1. A computer-implemented method, comprising: at a portable multifunction device with a touch screen display, displaying information on the touch screen display in a portrait orientation; detecting simultaneous rotation of two thumbs in a first sense of rotation on the touch screen display; in response to detecting the simultaneous rotation of the two thumbs in the first sense of rotation, displaying the information in a landscape orientation; detecting simultaneous rotation of the two thumbs in a second sense of rotation that is opposite the first sense of rotation; and in response to detecting the simultaneous rotation of the two thumbs in the second sense of rotation, displaying the information in a portrait orientation.