Here are a few tips I found:
Prevent static build up in your hair by keeping it moisturized with a good conditioner. If that isn't enough, try rubbing a dryer sheet (which chemically reduces static) through your brush or even through the hair itself. You can keep a dryer sheet in your purse or pocket for a quick touch-up during the day. Use combs and brushes made of non-conducting materials, like wood or nylon to prevent static. Be sure to also use a humidifier in your home to reduce dry air in the winter time. Use a "leave-in" conditioner on your hair after you wash it, or apply conditioning hair gel.