Aside from zucchini bread which freezes wonderfully, I like to grate zucchini with a box grater and saute in a little bit of olive oil with crushed garlic. Expand or decrease depending on how many servings you need. It is always a hit and really simple!
I also like that casserole with stuffing mix, a little sauteed onion, and cream of chicken soup. I don't have a recipe - just mix up whatever I need, bake and serve. Maybe someone here has a "real" recipe?