Sony on Tuesday announced the Reader Daily Edition, a new entry into its line of Reader e-book reading devices. The Reader Daily Edition will be released in December for $399. The company also announced enhancements to the "ecosystem" for its Reader devices to help expand the reach of e-books that will work with Sony Reader devices.

The Reader Daily Edition is the third e-book reader introduced by Sony in recent weeks. It's also the largest, featuring a seven-inch wide touch screen display designed to let users read books, newspapers, and magazines in portrait or landscape orientation. (Sony's $199 and $299 Pocket and Touch Edition Readers feature five and six-inch screens, respectively.) The e-ink "Vizplex" display is greyscale-it can display 16 levels of greyscale-and the Reader Daily Edition comes in an aluminum chassis with integrated cover.

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