Ars Technica reviewer Casey Johnston gives a mildly positive review to the Oyster book-rental app (and associated site), which intentionally tries to be for books what Netflix has become for movies: a low-price, subscription-based, data-sifting source of first resort. For $10 a month, users can read any of the books in Oyster's catalog (in the range of 100,000, and growing), and their reading habits are used to suggest new books of interest (with some bum steers, it seems, at present). It's iOS-only for now, with an Android version expected soon. I've only grudgingly moved more and more of my reading to tablets, but now am glad I have; still, I don't like the idea of having my books disappear if I don't pay a continuing subscription. 
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