I've used it before... it was pretty good.... this is one I used (need to find out who created it so I can give them props)...
Coffee Bubba Q Rub
1/2C Sugar in the Raw (Turbinado)
2T Sweet Paprika (Hungarian)
1T Fine Ground Coffee
1T Kosher Salt
1T Chili Powder (contains some Cumin and Oregano) Ancho Chile is same without cumin, oregano etc.
1T Granulated Garlic
1T Granulated Onion
1T Black Pepper, more if you like
1tsp Ground Coriander
1tsp Ground Dill Seed
1/2tsp Grnd Allspice
Cayenne or Chipotle Pwd to taste, start with 1/2tsp and go from there