I found this recipe in on of Rick Bayless's Mexican cookbooks and we loved it.
1 lb zucchini, 1/2 inch dice
1-2 T oil
1/2 sliced onion
1 c corn (either frozen or cut off the cob)
1 poblano's worth rajas
Salt to taste
2/3 cup crema or sour cream
Fry the zucchini in the oil till just tender, then set aside, leaving the oil in the pan. Cook the onion for a few minutes, then add the corn and rajas and cook till the onion is soft and maybe getting a little brown. Add the crema and zucchini, stir, simmer a minute, salt, and serve.