First, grilling? Broiling? what part of the chicken? What are you eating with it?
Edit: in the mean time, I have found that yes, Italian dressing is a good all around marinade, but... I have found the best thing for grilled chicken breasts is a mixture of Mayo (full fat) garlic, onion power and paprika.
It sound disgusting, but the mayo really keeps it tender and when you are grilling, it all burns off leaving nothing but expectionally juicy chicken to an otherwise dry piece of poultry. You could also try buttermilk in place of mayo.
If you want to do more of a mediterranian recipe, use olive oil, balsamic vinegar, orange juice, few springs of rosemary and garlic.
For asian, simply soy sauce, olive oil a dash of seasme seeds, ginger hot mustard and lemon juice.