In a non-aluminum medium skillet, combine scallops with white wine. Bring to a boil over medium high heat. Turn off heat and let scallops stand in wine 5 minutes. Drain, discarding wine. Transfer scallops to glass bowl and let cool. Add tomato, shallot, vinegar,oil, capers, and crushed red pepper flakes. Season to taste with salt and pepper. Toss gently but well. Chill 30 minutes before serving.