Here's a good recipe to try if you have a source of zucchinis -
(It's also a sneaky way to get your kids to eat zucchini!

)
1/2 cup margarine, softened
1/2 cup vegetable oil
1 3/4 cup white sugar
3 eggs
1 tsp vanilla
1/2 cup sour milk (I make sour milk by adding vinegar to sweet milk - about 1 tbsp vinegar per cup of milk)
2 1/2 cups all purpose flour
4 tbsp cocoa
1/2 tsp baking powder
1 tsp baking soda
1/2 tsp cinnamon
2 cups shredded zucchini or pulp (you can leave the skin on but there will be 'tell-tale' green spots in the cake)
1/4 cup chocolate chips
Cream together margarine, oil and sugar. Add eggs, vanilla and sour milk. Beat well with a mixer. Add dry ingredients. Stir in zucchini and chocolate chips.
Spoon into a well-greased 9 by 12 pan and bake in 350 degree oven for 45 to 60 min or until done.
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I've been baking this recipe as cupcakes (bake for 25 to 30 mins) because it's more convenient for freezing and for eating when there's only 2 of us in the house.