Authors are not always the techiest people around (I have a friend who's a writer who finally connected her speakers to her computer for the first time, and gave up dial-up for broadband this past year

), so I'm not going to look askance at one who doesn't list an ereader. But if I were an author, and my books were being made available in electronic versions, I would damn sure want to be able to see how they display in the various formats and what the reading experience is like on an ereader. So I would get myself at least one.
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@queentess - Thanks for clearing that up.