1. Preheat broiler with oven rack 6 inches away from element. Place butter in a large roasting pan, and place pan in oven just until butter melts.
2. Remove pan from oven, and stir in wine and next 6 ingredients. Add shrimp, scallops, and tomatoes, tossing to coat.
3. Return pan to oven, and broil 3 minutes. Stir shrimp and turn scallops; broil 2 more minutes. Remove pan from oven, and add spinach, tossing about 1 minute or until slightly wilted. Serve with French bread.