Barnes & Noble just announced its latest ereader: The Nook Simple Touch with GlowLight. It doesn't look any different from the previous model until you turn it on. That's when the magic happens. Powered by a front-lit screen dubbed GlowLight, the new Nook emits a pleasant glow that's sort of different from traditional backlighting. It's easier on the eyes but the light cuts the battery life in half -- which honestly is not that big of a deal.