I wish I could blame this on shoddy craftsmanship or a DRM snafu, but I'm guessing this is probably the result of my foot. All I know is that I put it in my bag one morning and when I removed it in the afternoon the screen no longer updated. There's not a crack, per se, but you can tell it looks like something fractured underneath the plastic.
My Kindle was given to me as a press preview unit, so I can't exactly complain. I'd come to enjoy having the Kindle at hand more than I'd expected, but I still don't think I'll be paying $400 to get a new one.
I had just gotten it really stuffed with eBooks, too.