Apologies if I seemed flippant -- things are changing so quickly nowawdays that apart from a few core texts on algorithms and programming languages, I've pretty much stopped expanding my library. It seems to be stackexchange and blog posts across the board now.
I suspect I'll pay for this choice sooner or later...
I avoid tech books on anything that's changing quickly - like frameworks. It's a waste of paper and ink, IMO. I get those in e-book format instead. I do however buy dead-tree versions of stuff that won't change fast or that I expect to flip back and forth.