Preheat broiler to high. Lightly oil (or spray with Pam) shallow flameproof baking dish or small broiler pan large enough to hold fillets in one layer. Place fish, skin side down, in pan. Blend mayonnaise, lime juice and half of the dill. Brush tops of fillets with mixture. Let sit 5 to 10 minutes only. Place fish about 12 inches from broiler (or if it must be closer, reduce heat to 400°). Broil 10 minutes (will be golden brown). Serve sprinkled with remaining dill and garnished with lime wedges. Salmon steaks, scrod or any white fish is delicious with this method.