The figures look a bit suspect. If there is <1bn from ebooks in total, but Amazon are making >10x that from music/books/DVD, while selling more ebooks than paper, that would suggest <~2bn books, >10bn music/DVD. There aren't enough figures to be certain, but my guess is that there are more total ebook sales than claimed (or maybe that was FY to end March 2010 with explosive growth since).
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