NEW YORK -- Sony (NYSE: SNE) last week renewed its assault on the Amazon Kindle, unveiling a new version of its Reader Digital Book e-reader, the Daily Edition, which sports a 3G wireless connection and a 7-inch touchscreen.

The new, $399 model will be available in December, "in time for the holidays," said Steve Haber, president of Sony's Digital Reading business division, during a press conference here today at the New York Public Library.

In addition to the Daily Edition, Sony today also showed off the Touch Edition, with a 6-inch screen and a suggested retail price of $299, and the Pocket Edition, with a 5-inch screen, and a suggested price tag of $199. The Touch Edition and Pocket Edition, which were announced earlier this month, are available now.

The devices use an updated version of Sony's software, eBook Library version 3.0, which adds Mac compatibility. The software can read .PDF files, Microsoft Word files, and files in several other common formats.

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