For the car - I leave snow tires on the car year round, so I just throw in a snow brush, and fill the washer fluid with my special no-freeze mix. If I have any water bottles in the trunk, I remove them.

For the garage - If I'm smart, I winterize the lawn mowers. Usually I'm not smart.

For the house - Check the fuel supply, have the furnace checked if it's been a while, bring in any hoses, possibly prune trees.

I have a backup kerosene heater, and I should do the annual check up on it. I should have my trees checked, too. Have the name of a guy to call, just haven't made the call yet.