Reading Usable Help
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Gordon R. Meyer
An eBook usability triangle
In The eBook Triangle, Dorothea Salo urges electronic book authors to consider three aspects of their publication -- Appearance, Behavior, and Identity.
It's a good article for seeding some "beyond the book" thinking. Each aspect provides opportunities beyond that of printed media, if embraced: "Production experts roll their eyes when presented with impossible demands or forced to use a print convention that makes no sense in an eBook."