In a large pot, boil the ears of corn for 5 minutes (husks removed). For a charred flavor, rub the corn with mayonnaise and salt and pepper, and grill until charred. Either way, allow the cooked corn to cool; cut off the cob. Place in a large bowl.
Add to the corn the cherry tomatoes (optional to cut in half), chopped cabbage, cilantro, jalapeno, radishes, and 1 cup of cheese.
In a small bowl, make the dressing (mayonnaise, lime, chili powder, cumin, and salt and pepper to taste). Zest each lime, and then juice them; add to the dressing. Mix together.
Pour the dressing over the corn mixture. Lightly toss.
Garnish with a few cherry tomatoes and fresh cilantro. Sprinkle with more cheese (optional). Cover and chill until ready to serve!