Credit: Amazon

Amazon's portable, handheld reader, which allows users to download digital versions of books, newspapers, and magazines, represents one of the first consumer uses of a low-power, easy-to-read electrophoretic display. The $399 device is a breeze to use, and though the company has not disclosed sales numbers, demand quickly outstripped supply. However, the success of the Kindle may depend on consumers' willingness to bear the price of using it: though e-books, at $9.99, cost less than most physical books, newspapers, blogs, and other content available free on the Internet will cost money (for instance, $1.99 per month for Slashdot and $13.99 per month for the New York Times).

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