Is there any decent, removable, anti-glare screen for the iPad? I love the screen of the iPad inside, but when I wander outside during the day it's pretty unusable. Ideally, I'd love to have either a screen protector or a cover that I could use when I'm outside, and not use when I'm inside. Not sure if any of the screen protectors are removable (and reapply-able), but I'd be happy with a case that has some sort of screen protector built in too. I'm guessing I'm out of luck on this one, but I thought I'd ask. Thanks!