"This touch screen is not intended to be hacked into an off-the-shelf Play Station Portable. It is solely meant to be a nice add-on to our 24-Bit color display."
it says it's a 4 wire screen, you could wire the touch screen directly to the analog connections. Some modder in the phillipines who frequents this site did something along those lines, i think he said it wasnt particularly efficient, and you wouldnt be able to use it as a cursor i dont think. there's an attatchment that goes into the usb port, but it would require your own custom firmware.