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Value-add for ebooks probably deserves its own thread, but I'll offer a few suggestions:
- Excerpts from other books by the same author or publisher
- Interviews with the author
- Audio files of the author reading an excerpt
- Scans of notes, maps, sketches, photos or other prep material the author accumulated while writing the book (this part of Rowling's website, for example, is extremely popular)
- Character indices or concordances
- Images of covers used in other countries or for other editions
- Popup map with links on place names throughout the text that take you to the right place on the map (think Children of Hurin)
- Embedded links to online book communities, with functionality possibly similar to DotReader (iLiad or Kindle could easily support this)
- Discount coupons for other books by the same author or publisher
Some of these features would cost the publisher more than others, but most aren't especially expensive or difficult to create. Much of this material already exists somewhere, and would just need to be located and/or converted to an appropriate format for inclusion.
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