MongoDB: The Definitive Guide 2nd Edition is Out! by Kristina Chodorow.
From the webpage:
The second edition of MongoDB: The Definitive Guide is now available from O’Reilly! It covers both developing with and administering MongoDB. The book is language-agnostic: almost all of the examples are in JavaScript.
Looking forward to enjoying the second edition as much as the first!
Although, I am not really sure that always using JavaScript means you are “language-agnostic.” 😉