This is the sort of thing that makes me wish I knew more about beer. My usual unit of measurement is the purely subjective, but relatively simple, MPS, or Maggie Preference Scale. (IPAs near the bottom, porters near the top, your mileage may vary.)
Full Chart via Flickr user John602, don't know if that's the original source though.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.