With the DS and its hugely successful touch screen, it seems only obvious that Sony may want to jump on this bandwagon. Er did I say Sony? Let me start over:
With the DS and its hugely successful touch screen, it seems only obvious that the homebrew/hacking community would bring a product to light that may be able to do just that.
While perusing the website for 0x89 found here @ http://0x89.org it came to my attention of a news update from harleyg.
Apparently harleyg and his team are working on a prototype touch screen for the PSP, which as the concept images indicate, is USB and mounts to the top of the PSP via the two screw holes on the sides of the USB port.
This brings forth many questions, most notably, how will this unit work? It seems obvious to me that the unit will work with 0x89, but mind you, details are sketchy at the moment.