1. Combine first 3 ingredients in a heavy saucepan; let stand 2 minutes. Cook over medium-high heat to 180° or until tiny bubbles form around edge (do not boil). Remove from heat, and add chocolate; cover and let stand 5 minutes. Stir until chocolate melts.
2. Pour chocolate mixture into a medium bowl; cover and chill 30 minutes or until set. Gently fold in whipped topping. Spoon about 2/3 cup mousse into each of 8 dessert bowls. Cover at least 2 hours or until set. Top each serving with 1 1/2 teaspoons coconut and 1 1/2 teaspoons pecans.