In a saucepan, combine sugar and water; bring to boiling. Add cranberries; return to boiling. Reduce heat and simmer over low heat for 5 to 10 minutes or until cranberries pop and mixture thickens. Remove from heat and stir in orange zest and orange juice. Set aside.

Preheat oven to 350°F. Place phyllo shells on a baking sheet. Place one cube of Brie in each phyllo shell. Cover with foil and bake for 10 to 15 minutes or until Brie is melted. Remove from oven; top each tart with 1 to 1½ teaspoons of cranberry mixture. Garnish with additional orange zest.