I'll love it if Nintendo ever adds shoulder buttons to a portable system. Then we can say that Nintendo copied Sony on portable gaming systems! I mean, let's really get down to specifics. Nevermind that shoulder buttons were around long before and they just happened to move to portable systems.
Same thing with touchscreens. Nintendo used it a pure gaming system first. Ok. As others have said, PDAs and phones have them before. Let's move on...