I don't know Harbison & Steele, but both Effective Java and Javascript: The Good Parts are really excellent. Worth noting that they're both really only about the language, not the accompanying libraries/environments.
H&S is what I thought K&R would be, but wasn't. It's an obsessively detailed description of the C language and standard libraries, in readable english, that describes everything from "traditional C" through ISO, to C++ compatible. When I'm working in C I use it as much as I use man pages, to help me keep the code as standard and cross-platform as possible.
"Steele" is Guy Steele, btw - http://en.wikipedia.org/wiki/Guy_L._Steele,_Jr. (author of "Common Lisp, The Language", developer of Fortress, etc etc).