Not related at all but I find it amusing you can look at the iPad and determine by the screen smudges what task it's been used for recently. Horizontal lines on

Not related at all but I find it amusing you can look at the iPad and determine by the screen smudges what task it's been used for recently. Horizontal lines on the right side? You've been reading a book. I'm wondering if anyone else has noticed that on a glossy touchscreen, over time, some magical process happens (filth build up? chemical reaction?) where smudges just aren't very noticeable anymore. My iPhone 3G screen for example looks smudge free but I know if I give it a good cleaning it's really filthy. My theory is a base coat of filth builds up which is actually a good smudge repellent.