In a large zipbag, mix yogurt with juice from 1 lemon, add 2 tsp curry powder, 2 tsp paprika, 1 tsp ground dry mustard, 1 tsp ground cumin, 1 tsp ground coriander, 1/2 tsp ground ginger, 1/2 tsp garlic powder. Add chicken and marinate for at least 4 hours. Grill until chicken is done.
Or you can also mix (in a large zipbag), yogurt with 1/2 - 3/4 cup of your favorite fresh salsa. I like to use the baja salsa from "Baja Fresh" restaurant. Marinate chicken at least 4 hours then grill.