In a shallow bowl, combine lime juice, soy sauce, vegetable oil, sugar and garlic; mix well. Add chicken, turning to coat with marinade. Cover and refrigerate 1 hour.
Meanwhile, in small bowl, combine yogurt, scallions, curry powder and sesame oil. Cover and refrigerate until ready to use.
Remove chicken from marinade and cut into 3/4-inch cubes; reserve marinade. On each of 10 to 12 skewers, thread 4 to 5 chicken cubes. Preheat broiler. Place skewers in broiler pan; broil 4 inches from heat source 8 to 10 minutes until cooked through, turning once and brushing occasionally with marinade. Serve kebobs with curried yogurt dip.
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