15 Ways To Winterize Your Home (Steps 1-5 below; the rest continued at later date)
(reprinted from Insure.com)

Step 1. Make sure your furnace is in good working order. If it has a filter, check that the filter is clean. Ensure that the thermostat and pilot light are working properly and that the pipe bringing fuel to your furnace isn't leaking or loose.

Step 2. Have your heating ducts cleaned. It's recommended that the ducts be vacuumed every five years.

Step 3. Trim trees and remove dead branches. Ice, snow, and wind could cause weak trees or branches to break, damaging your home or car, or even injuring someone.

Step 4. Get those leaves out of your gutters. Cleaning them out should prevent water from building up and freezing in the gutters.

Step 5. Prevent ice dams from forming. When snow melts on the roof, the water will usually run down and refreeze at edge of the roof. This is where ice builds up and blocks water from draining off. This forces the water under the roof covering and possibly into your attic or down the inside walls of your home.