That brings us back to one of the strongest intrinsic advantages of e-books: The fact that they can be read on a wide variety of hardware choices. Right now, a lot of people don't have the hardware they really like reading e-books on (either because it's too expensive for them to buy, or because it hasn't been invented yet), so for them, e-book readers aren't here yet. But a lot of us do have the hardware we're comfortable with, so for us, e-book readers are here already. It's a very subjective thing.
I suppose the only way to answer such a question is to decide how large a percentage of the population has to own a reader they are happy with, to determine when e-book readers are considered to be "here." Even then, I'm not sure it will be a definitive answer.
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