I'd like to offer a partial thumbs-down to the one non-programming book suggestion: Strunk & White's Elements of Style has been criticized as, well, not the best possible advice, by G.K. Pullum, here: http://chronicle.com/article/50-Years-of-Stupid-Grammar/2549...

I think many of us could do worse than to follow S&W's writing advice, but I also think the book is given more reverence than it's worth, maybe just because it's been a tradition in English education.