There is nothing I like better in my burritos than corn salsa, I just love the little bursts of sweetness it adds. You can use thawed frozen or drained canned corn, I haven't noticed a difference either way.
2 c. corn (thawed frozen or drained canned)
1 c. seeded and diced tomato
2 green onions, chopped
3 Tbs chopped cilantro, more or less to taste, whatever you like
1 Tbs. seeded and finely minced jalapeno
1 Tbs lime juice
salt to taste
Combine all ingredients and let chill in the refrigerator for at least two hours.