With over 500,000 units sold, the Amazon Kindle e-book reader might just be the coolest thing to happen to books since Gutenberg, but just because something isn't broken, doesn't mean you can't make it better. Enter Kindle 2 ($359), a svelte device overhaul featuring the sort of upgrades that seem to imply that Amazon actually listens to its customers. Weighing in at just 10.2-ounces, the K2 has a larger screen than its predecessor and can still hold a charge for days. It includes the built in 3G wireless (for no extra fee), allowing you to download content, lookup subjects on Wikipedia and more. If you found you ever found yourself on the verge of ordering a Kindle, but couldn't pull the trigger, your salvation is here. Kindle 2 will ship on Feb. 24, so pre-order yours today.