Meet Ngram, an intriguing data-mining device from Google that charts the relative citation of any words or phrases in all books published (that are in the Google database).

Enter your own words & phrases. 1001 uses – especially procrastination in the guise of ‘market research’!

Relative Usage of the Terms "vampire" "werewolf" "zombie" and "apocalypse" in all books published
Use of “vampire” “werewolf” “zombie” and “apocalypse” in all books published