Seems like the perfect gift for the guy who has everything and spends most of his reading time with his head on a pillow. Other readers in the past caused problems with eye strain; the screens were illuminated to let you see them in the dark (or, really, see them at all.) But Sony and MIT have solved that problem. The new PRS-500 inflicts no more eyestrain than your typical paperback. That’s because MIT-developed E-ink doesn’t glow like the backlit LCD screen on your computer monitor. Instead it uses microcapsules filled with oppositely charged black & white nanoparticles. Even better, the e-book reader can hold hundreds of books, and, thanks to those cool little nanoparticles, has a nearly inexhaustible battery.