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Sony on Tuesday announced its first e-book reader with built-in wireless capability. The new Reader Daily Edition offers an integrated 3G wireless connection, allowing it to access Sony's online bookstore as well as yet-to-be-announced newspaper and magazine subscriptions. The unit--which boasts a 7-inch touch screen (displayable in portrait or landscape mode)--will sell for $399 when it debuts in December. Wireless service is provided by AT&T with no direct charge to the customer.

The Reader Daily Edition joins the already announced Touch Edition PRS-600 ($299) and Pocket Edition PRS-300 ($199), both of which should be available within the next couple of weeks. With the exception of the wireless connection and larger screen, the specs of the Reader Daily Edition are otherwise in line with that of the Touch Edition: it offers an E Ink Vizplex electronic paper screen with 16 shades of gray.

Sony used the launch event at the New York Public Library to highlight some notable new features of its e-book platform. Most notable is the expansion of support for library loans to the Sony Readers. If your local library supports electronic lending, members will be able to download the borrowed books and transfer them to the Reader for 21 days (after which the files expire). Sony is partnering with Overdrive.com to make it easier to search for available books at participating libraries.

Also of note is the launch of version 3.0 of Sony's eBook Library software, which now offers support for Macs (as well as Windows). The software is used to move purchased files (as well as other supported content, such as a PDF and Epub files) from the computer to the Reader. (While supported, the PC step won't be required for the Reader Daily Edition, which can access online content directly.)

Sony also highlighted its new "open" Epub format, which the company is moving to from its former proprietary BBeB format. While the Epub books at Sony's store will still be encoded with DRM, it will allow the Sony Reader to also work with files purchased from BooksOnBoard, NetGalley, Powells.com, and any other retailer that adopts the Adobe-backed standard. (Notably, that does not include Amazon (which has its own proprietary Kindle standard) nor Barnes & Noble (which is working on its own Epub flavor for its forthcoming Plastic Logic reader).