Just discovered the Google Ngram Viewer, which searches out keywords in books, and displays them as trends over time. Sadly it only goes up to 2008, but this is still a lot of fun.
I'm not suprised that ghosts dominate, but I wonder if zombies give vampires a closer run for 2nd in the post 2008 period...
The Necronomicon, still the king of the imaginary, mind-devouring book world. Yes, there are 'real' Necronomicons which would skew this, ditto Chambers' The King in Yellow, but very fun. In fact, ignoring the other three books, is this a way of measuring the relative popularity of Lovecraft?
Genre reduced. I love this. Understandable, "rocket" is passe, but what's the equivalent? "spaceship" fares much, much worse.
Way too much fun... please share your own Ngram calculations in the comments!