From FoodTV.com, with some alterations.
Rub mixture:
2 tablespoons smoky paprika
2 tablespoons kosher salt
3 tablespoons sugar
2 tablespoons brown sugar
1 tablespoon ground cumin
2 teaspoons chili powder
1 tablespoon freshly ground black pepper
1/2 teaspoon cayenne pepper
1 tablespoon onion powder
1 tablespoon garlic powder
1 tablespoon celery salt
1 teaspoon oregano, crushed
Rub the ribs generously up to 24 hours ahead of cooking time.
Set oven to 210 degrees Fahrenheit. Baste ribs with a thick coat of your favourite BBQ sauce. Place in oven. Baste ribs every hour with more bbq sauce. Ribs should be done in approximately 5 to 6 hours (or until meat is falling off the bone).