Uh, not much.
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Unboxed: Amazon Kindle 2 gets iPod treatment. Will it sell?: "Amazon's second generation of its Kindle ebook reader takes cues from Apple in hopes to make the new product the 'iPod of books.' Here's a graphical tour of how close Amazon comes to replicating the iPod experience."
(Via AppleInsider.)
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Why pay $350+ for this when you can read books on your iPhone or iPod Touch ($229+) AND play music AND watch movie AND collect photos AND play great games AND AND AND...