For theory, absolutely.
Its still hard to beat the Dragon books for compiler theory, and SICP, Lisp In Small Pieces and others are still some of the best for PLT.
New skills tends to be different, because the technology is new, theoretical underpinnings haven't been researched well enough to be expanded out into a book.
I'd never get a book on jQuery, because I don't need the theoretical underpinning, just the documentation. A basic understanding of the implementation is enough.
However, I would pick up a book on Dot, the Typed Calculus being explored with Scala in the Dotty compiler. Because I'd be learning the mathematics of type safety, and using types to more effeciently generate machine code. However, learning to use Scala would be incidental to that experience.