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Yes to the C book. It seems because of the age of C that there is a gap in the literature for a more up-to-date book (one that would be pre-K&R).

Harbinson & Steele's "C: A Reference Manual" is updated to cover C99 in the 5th ed: http://www.careferencemanual.com/

Admittedly, probably not the best beginner's introduction, so there's still a gap there.

I second that. I already 'know' C, but it's mostly self-taught, and I feel like I'm missing a lot of the little tricks and some of the fundamentals.

Also, even if it only had a chapter on ZeroMQ, I'd be ecstatic. I've messed around with it a little, but a good review of it would be wonderful.

On the off-chance that you haven't seen it yet, the ZeroMQ guide got a lot better a while ago:

It's surprisingly well-written, and I wish it had existed when I first tried to learn ZeroMQ.