I'd love to touch my screen! I'd also like my keyboard, mouse and monitors to be touch sensitive screens (same form factor but made with a 'screen' layered over them. So my mouse/keyboard can be completely customizable to the task at hand.

Now if they can get the screen surface to change texture AS WELL as the light that it emits it would be amazing. Rough and smooth surfaces for buttons etc.

Touch screens don't need to just be classic 'screens'.