I've been waiting for a book on C from No Starch Press, so I'm really excited for this one.
This might not be too deep a question on the C language in regards to this book, but I've been wondering, why did you decide to have an eldritch horror as the book's cover?
It's a longish story, but people do seem to like the cover. We started equating the idea of C == Sea, so we had some early drawings of the robot riding various undersea creatures including a giant squid. I thought that looked overly phallic, so I suggested the robot ride Cthulhu instead, an unofficial mascot of NCC Group.
I've stumbled uppon it recently (significant active use was before my time) and I'm in love with its simplicity compared with modern formats. I was hoping for something to get me into the protocol as well.
I agree, it's hard to choose from so many awesome domains.