Heat coals or gas grill for direct heat. In large bowl, toss corn, zucchini, bell pepper, onion and chiles with oil. Place in grill basket (grill “wok”).
Cover and grill vegetables over medium heat 25 to 30 minutes, shaking basket or stirring occasionally, until vegetables are tender. Add tomatoes to basket; cover and grill 1 to 2 minutes longer or until tomatoes are hot. Remove basket from grill; cool vegetables 15 minutes.
Cut corn off cobs (about 1 cup kernels); chop all remaining vegetables into small pieces. In large bowl, mix vegetables, lime peel, cilantro and salt. Serve immediately, or cover and refrigerate up to 24 hours. Serve with tortilla chips. Store covered in refrigerator.