i've never used a screen protector on my n800 and rarely used one on my n770. i've had the 770 forever and the n800 since they came out (i bought a review sample). neither screen shows even the slightest amount of wear. i use the supplied stylus with each, except when i use a pencil (lead) or a ballpoint pen. i carry the nits around in my pockets all the time.

i also have a sony clie palm device that must be at least 4 years old. i used the plastic screen cover that came with it for a few weeks but finally got tired of it. i lost the stylus after a few months and have used any sharp object (pencil, pen, screwdriver, fork tine, rock, etc.) on that screen since then. still shows no damage.

john