Here are two of my favorite marinades for chicken. The first is a recipe we've been using for the past 17 years whenever we barbecue chicken (we also use it to marinate turkey breast meat).
The second marinade is a little sweeter.
2 cups 7-up
1 c. canola oil
1 cup soy sauce
1 tsp. garlic salt
1 T. Horseradish (optional)
Stir well (it will be foamy). Marinade chicken anywhere from 2 hours to overnight. Grill chicken on grill.
1/2 cup honey
1/4 cup freshly squeezed lime juice
1/3 cup soy sauce
4 chicken breasts
Marinade chicken from 2-4 hours. Grill on grill. Discard leftover marinade.