My Sony screen just busted right in the middle, something in the lugguge punched through the cover.
But I can still use it, sort of. The bottom half of the screen is fine. So I have converted some books with Calibre with a 160pt top margin. I only get half a page, but that just means twice the page turns. Works until the non-Kindles come out with Pearl Screens or the new Sonys with Pearl drop a lot.