O'Reilly Media book: ZeroMQ – Messaging for Many Applications

ZeroMQ:
Discover why ZeroMQ is rapidly becoming the programming framework of choice for exchanging messages between systems. With this practical, fast-paced guide, you’ll learn how to use this lightweight and highly flexible networking tool for message passing in clusters, the cloud, and other multi-system environments. Created by ZeroMQ maintainer Pieter Hintjens and volunteers from the framework’s community, this book takes you on a tour of different real-world applications, with extended examples in C.

O'Reilly Media book: 21st Century C

21st Century C:
If you know how to program with a general purpose language such as Ruby or Python, you can also learn how to use the C language in a practical and modern style. However, you need many techniques that are entirely absent from every C textbook on the market—except this one. 21st Century C assembles all the tools you need to write efficient, state-of-the-art programs with C.

Update 2012-08-13
No print book yet.

Marpa parses anything you can write in BNF, including ambiguous and even infinitely ambiguous grammars - Jeffrey Kegler

Marpa - Jeffrey Kegler

"The Ruby Programming Language" – THE book on Ruby by Matz

The book is co-authored by a 1st-class author this time: David Flanagan.
And the book follows the lines of a classic book of the Unix universe: The C Programming Language by Brian Kernighan and Dennis Ritchie.