Place chicken in large resealable plastic bag or glass dish. Add 1 cup of the marinade; turn to coat well. Refrigerate 30 minutes or longer for extra flavor. Remove chicken from marinade. Discard any remaining marinade.
Grill chicken over medium-high heat 6 to 8 minutes per side or until cooked through, brushing with fresh marinade, if desired. Remove from grill.
Brush tomato halves with remaining 1/4 cup marinade. Grill over medium-high heat 2 minutes per side or until lightly charred. Remove from grill. Let cool slightly. Chop tomatoes and place in medium bowl. Add olive oil and vinegar; toss gently to coat. Serve grilled chicken topped with tomato bruschetta mixture. Refrigerate any leftover chicken and tomato bruschetta mixture to create another delicious meal.
Make Once, Eat Twice: Use 4 leftover chicken breasts and about 2/3 cup of the tomato bruschetta mixture to prepare Chicken Bruschetta Sandwiches.