A Sony patent application filed back in October of 2009 and published today shows handheld devices with two-fingered touch selection and transformation of elements. As shown in the image above, the user can do something such as rotate an object by using their two fingers as shown.
Below is a description from the patent application:
A hand-held electronic device, method of operation and computer readable medium are disclosed. The device may include a case having one or more major surfaces. A visual display and a touch interface are disposed on at least one of the major surfaces. A processor is operably coupled to the visual display and touch screen. Instructions executable by the processor may be configured to a) present an image on the visual display containing one or more active elements; b) correlate one or more active portions of the touch interface to one or more corresponding active elements in the image on the visual display; and c) re-purpose one or more portions of the touch interface outside the one or more active portions to act as inputs for commands associated with the one or more active elements.
They go on to mention several devices that could use something similar. We already know that the long-rumored PSP 2 may have a touch panel, possibly even the PSP Phone. We won't know for a while though: