http://www.coolhunting.com/archives/2008/05/transparent_pos.php

Can you imagine how successful this product would’ve been back when books were significantly more ubiquitous.

I think they should try and sell this to college students. What better way to try and keep a used book new than to not leave any marks in it.

The losers of this product? Guys like me, who preferred their used books completely marked up for them. Its like Cliff notes on the cheap.