Place water in a small microwave-safe bowl. Microwave at HIGH 1 1/2 minutes or until water boils. Remove from heat, and stir in couscous. Cover and let stand 5 minutes or until liquid is absorbed; fluff with a fork. Spoon onto a baking sheet, and spread in a thin layer; let stand 7 minutes or until cool.
Combine tomato, next 5 ingredients, and 1/4 cup dressing in a bowl. Add cooled couscous to parsley mixture, and toss well.
Combine spinach and 1/4 cup dressing; toss gently. Place spinach mixture on each of 4 individual plates. Top with couscous mixture.