A recent book, Gamer Theory by McKenzie Wark:
http://web.futureofthebook.org/mckenziewark/gamertheory2.0/
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Besides contents, the online version of Gamer Theory looks very appealing in terms of a new way of designing e-book. In particular, it provides a collection of visualization of the texts using “Textarc” It’s quite fun to play with: http://web.futureofthebook.org/mckenziewark/gamertheory3.0/textarc