Amazon’s Kindle. Check out the video demonstration halfway down the page. And it holds two hundred books.
Alas, at $399, I won’t be getting one. My mother should, though–you can change the text size to make it large print, and it’s not backlit like a computer screen, so you can read both outdoors and indoors with ease.
Maybe in ten years or so. Right now I need to get a new washing machine.