Do you have any quicky hints for riding in cold weather?
Here are a couple:
1) When breathing in cold air, put your tongue on the roof of your mouth and breath through your mouth. Your tongue will warm up the air a bit and help prevent freezing your throat and lungs. Your tongue might get a little cold, but it won't freeze.
2) If your hands get cold, wrap them in a wool or other breathe-able fabric (like a knit hat or your shirt/sweater tail) and breathe warm air from your mouth into the fabric. This will hold the warm moist air on the skin longer and will warm your hands up faster.
This trick works well if you are riding with someone who get's cold ears as well.
3) Similar to the hint above, if you are riding with children who get cold, pull their collar up so that it covers the back of their necks and breathe into the fabric, then put your hand over the fabric and hold it there while you take your next breath. Be careful with this one, some kids will pee their pants because it is so warm.
4) The ultimate hand/feet warmer is a warm belly. If you love your bicycle partner enough and if the situation warrants this drastic measure, let her/him slip their cold hands under your sweater and onto your warm stomach. Of course, this is the ultimate sacrifice, but it is long remembered by the thankful recipient. I let my wife and kids do this once - all at the same time. I was the hero of the day.