CAKE: In a large mixing bowl combine sugar, oil and eggs, beating until well blended. Add All-bran, zucchini, orange peel and nuts. Add flour, mixed with baking powder, baking soda and salt. Blend well. Spread batter in a greased and floured 6x10x2 pan or baking dish. Bake at 325 degrees for 35 minutes or until tester inserted in center of loaf comes out clean. Cool completely.
FROSTING: In a small mixing bowl beat cream cheese, oleo and orange peel until light and fluffy. Gradually add the powdered sugar, beating until fluffy and spreading consistency. Add milk sparingly if needed.