I am a little obsessive when it comes to the appearance of my gadgets, so i usually cover them with the invisible shields out there. I am wondering if the new chiclet keyboards are prone to being 'rubbed out'. An example of this is the space key on a dell 700m keyboard I have. They key has some plastic that looks different than the surrounding (normal) plastic because i had rested my thumb on the spacebar inbetween typing words. Is the keyboard prone to this or not? I am wondering if I should find some kind of plastic cover to place on my keys.