What about a book for Linguistics? I also studied Linguistics and now while I still find the knowledge useful (getting to describe to my son a voiced vs unvoiced plosive) I am not as interested in it anymore.
Very interested in this. I'm currently learning a second language and my programmer brain keeps getting side tracked by _human language as an abstraction_ in and of itself. I'd be very interested in a basic intro to linguistics book that starts from first principles and goes through what grammar fundamentally is, syntax, morphology, etc.
Why Only Us: Language and Evolution by Chomsky and Berwick if you're interested in some of the deeper questions in linguistics. It's a bit heavy but aimed at a general technical audience.