They seem to support MobiPocket and Adobe ebook formats. The Kindle AZW format can reasonably be considered a closed single-device format, but MobiPocket's standard contract with authors and publishers allow Amazon to sell AZW versions of MOBI ebooks. This gives Amazon a big advantage over Sony. It is also a good deal for publishers, who have to do nothing at all to get Kindle sales from MOBI ebooks.
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