PC World - Amazon will soon roll out a new software upgrade for its Kindle and Kindle DX e-readers, and the coming enhancements look pretty good. The online retailer, which kick-started the e-book market by launching the original Kindle in 2007, has already begun distributing the version 2.5 update to a limited number of Kindle users. A broad release, which will be sent via automatic wireless updates, is slated for late May.

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