Artichoke Crostini

1 (1 pound) loaf sourdough baguette 2 cups chopped seeded tomatoes 1 (14 ounce) can water-packed artichoke hearts, rinsed, drained and chopped 2 tablespoons minced fresh basil 2 tablespoons olive oil 1/2 teaspoon seasoned salt 1/8 teaspoon pepper cooking spray...