O'Reilly just published an updated edition of their bestseller on Bitcoin technology, "Mastering Bitcoin," earlier this month.[1]

For a more general/conceptual understanding of blockchain technology and its applications, including non-cryptocurrency applications, "Blockchain Revolution" is a good read.[2]

[1] Mastering Bitcoin http://amzn.to/2uewdK9

[2] Blockchain Revolution http://amzn.to/2vniXSf

I find these three books entertaining.

[Blockchain Revolution by Don Tapscott, Alex Tapscott](https://www.amazon.com/Blockchain-Revolution-Technology-Chan...) [The Business Blockchain by William Mougayar](https://www.amazon.com/Business-Blockchain-Practice-Applicat...) [Digital Gold by Nathaniel Popper](https://www.amazon.co.jp/Digital-Gold-Bitcoin-Millionaires-R...)

If you want to dig deeper, read [Mastering Bitcoin by Andreas M. Antonopoulos](https://www.amazon.com/Mastering-Bitcoin-Unlocking-Digital-C...).

I actually haven't read much more than academic papers, but I do plan on ordering this book: http://www.amazon.com/Blockchain-Revolution-Technology-Chang...