Frozen Pipes? Nooooo!

It's supposed to be 11º tonight! 
What do you do when the temperature is going to be reaaally cold? There are many things people do to keep pipes from freezing. Of course, good insulation is always great. You know, the foam pipe type stuff you slip over the pipes. But do you know any other tips, little tricks, that you do other than leaving the water dripping (in the other room where you can't hear it, ha).

I like to start a load of laundry right when I go to bed. That way, water will definitely be running through the pipes for a while.  Then I set my dishwasher to come on a few hours later.   That is at least another hour of water running. I know, the water dripping might be all I need, but these chores need to be done anyway.  And I normally do the dishwasher in the evening, and empty it the next morning to be filled throughout the day. So I just wait and set it when I go to bed.

We also have vents that let air flow under the house.  We close those when it's going to be really cold. 
If this won't work for you, what kinds of tips do you have? Leave a comment for me and other readers. Thanks!