Skyler Johnson created an interactive infographic that charts the use of magic in J.K. Rowling's Harry Potter novels. The spells are organized by count or time, with instances color-coded by the book they appear in. Hover over each use and you even get the quote, for context! [via Tor and Metafilter]
Emily Asher-Perrin writes:
Perhaps not surprisingly, the spells that we see used most often are commonly used by Harry and his friends as means of non-violent resistance; Expecto Patronum; Expelliarmus; Stupefy. The Killing Curse appears sixth down on the list, which is fascinating–it is technically speaking the "most evil" of all the dark magic spells, and it is the most often used.