So I was sitting on the worst part of the plane flight, right after they told me to shut off all electronic devices. Being a good traveler, I stowed my Kindle and looked around for something to do. Ah! SkyMall magazine. Always a good way to waste a few minutes. In and around the usual silliness, I found a couple of items that would actually be useful to an e-book reader. What do you think of these? 1. iPad Power Case ($129.95) iPad batteries are good, but they can't stand up to marathon reading sessions. This one sports a 9000mAh battery, which should give...