I wish Dr. Tarver would make his Book of Shen[1] available via Google Play[2] (or similar). I rarely purchase paper books these days (especially technical books), but am very happy to pay for well-written books and read them on my iPad.

[1] http://www.fast-print.net/bookshop/1506/the-book-of-shen-sec...

[2] https://play.google.com/books/publish/