Kindle will add epub when the market demands it. With a focus on mobi, and the fact that most libraries still support mobi, there's no pressure. But libraries are now building files almost exclusively around epub to push a single format (at least locally where I am). They're doing away with lrf peculiar texts and they do offer texts in mobi. But more and more the texts are epub. When Kindle owners begin complaining they can't download library books, the pressure will rise. I have owned a 505 for 3.5 years. Before buying a Nook color this week I looked at 12 different readers. Only 2 of the 12 failed to support epub; Kindle was one, IPAD was the other.
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