Moderation is the key. First, you have to look at your goal for the holiday eating. A good goal is for your weight to break even during the holidays. Look at your week, and plan your eating for special occasions. Also, do not neglect exercise.
People tend to forget it during the holidays.
Try to exercise 3-5 times a week, and don't skip meals. You may also want to consider having a light snack before a party so that you don't overeat. Both of those have online help as far as nutrition is concerned. You can also check out the support networks on Digital City Health. With no skin, you can drop it by about 100 calories.