Well, I am a salt and pepper smoker for most things, but here are two rubs that I use:
Pork Ribs = 1TBS cumin, 1 TBS paprika, 1 TBS garlic powder, 1 TBS onion powder, 1 TBS chili powder, 1 TBS brown sugar, 2 TBS salt, 1 TSP cayenne pepper and 1 TSP pepper - coat the ribs, and let them sit...