Finally! Latest Martin Fowler’s (http://martinfowler.com/) book - "NoSQL Distilled : A Brief Guide to the Emerging World of Polyglot Persistence" - has been published in both paperback and Kindle (http://www.amazon.com/NoSQL-Distilled-Emerging-Persistence-ebook/dp/B0090J3SYW/ref=tmmkintitle_0?ie=UTF8&qid=1345665032&sr=8-1)