Agreed. Obviously K&R is a benchmark. But I'm also thinking of "Effective C++". This was a fairly thin book, but after reading it, I realized that I didn't know half as much about C++ as I thought I did, and in its relatively small number of pages, it taught me a hugely disproportionate amount of how C++ really works.
"Accelerated C++" is another good one. A bigger book than K&R, but not outrageously so, and much thinner than Stroustrup's or Lippman's texts. Rather than teaching C and then layering C++ constructs on top, it starts with idiomatic C++, then drills down to the C foundations as needed.
I love the format of the whole "Effective ..." series, especially the fact that the books are focused on best practices instead of individual language features.
