The full edition of the Coffee Cupper's Handbook by Ted Lingle.  This is a 66 Page, 8.5 x 11 cupping manual that includes a full-color reproduction of the Coffee Cupper's Flavor Wheel on the inside covers ... very handy!

It features the SCAA coffee cupping scale, close to what I use at Sweet Maria's but a little different. And it has a huge glossary of terms that are cross-referenced between 8 coffee publications to give the fullest possible meaning to each term. It is extremely methodical, and the most complete manual specifically for cupping ever printed. I know my copy will be dog-eared and coffee-stained in no time at all!