Since it's multitouch, they could some analog mimic thing. I don't really see it that hard to pull of, honestly.
Sony does have a touch player..it's the Sony OLED MP3 Walkman (forgot the name of it though). It's been pretty hush-hush about it, Cnet just recently had their hands on with it
I take it your talking about the NW-A910, I dont consider a 2.4 inch touch screen, well a real touch screen, it way to small. Add on top the fact that it over priced... But I do like the mobile digital TV and nice packed in headphones.