oh, i didn't realise it's flexible.
It's extremely flexible! If you polish the screen and look at the iPad on an angle, while laying it on a flat surface, you'll notice its not hard to bend the glass with your finger.
Look at this also: http://www.youtube.com/watch?v=r4vvQq7BpiE
Look at how flexible the iPad 2 glass is. (even the original iPad's isn't too bad)