Preheat oven to 350 degrees F. Remove the stems and cores from cherry tomatoes. Spoon goat cheese into hollows, then stand the tomatoes upright in a baking dish. Sprinkle tops with bread crumbs and drizzle half the olive oil over the top. Bake about 15 minutes. In a salad bowl whisk remaining olive oil with vinegar and spices. Toss with arugula.