Sometimes, you want to curl up in bed with a good e-book, but you don't want to disturb your sleeping partner by turning on a light. Barnes & Noble has solved this thorny issue with the Nook Simple Touch with GlowLight. This 7-ounce E Ink e-reader features a glare-free screen for beach reading, long battery life and (finally) a screen with a built-in night-light so you can finish that last chapter before nodding off. At $139, this device costs $40 more than its nonilluminated older sibling. But is that money well spent?