Got a response on cold-weather commuting from NoRacer who has detailed his commute and who can be found on Facebook here: http://www.facebook.com/NoRacer.
So what does he do to keep warm on his--very impressive--commute? No detail is left uncovered. Get it? Uncovered? Sometimes I crack myself up.
But seriously, I'll give him the award for Most Creative Re-Use for Plastic Grocery Bags. Check the list and you'll see what I mean.
Thanks, NoRacer, and stay safe out there.