I ride year round, so I have never had to "Winterize" a bike! I agree with the others who ride during the winter months, though. Never use your bike for short trips, (less than 30 - 40 mins duration) just to get rid of the condensation, and to get your oil up to working temp. Make sure you keep an eye on your tire pressurs/condition, as the cold will have adverse affects on your riding technique, if your not careful! Also keep your exhaust pipes clean, and road salt, loves eating chrome, and you will quickly find that you have "Sky Pilot, exhausts" (Holy Silencers(Mufflers))
One or two other things, wrap up warmly,(many thin layers of clothing) and ride like your a figher pilot, in enemy territory! And think 500 yards ahead of your normal driving distances!
I know that the winters are milder here in the UK, but with a bit of thought, and care, riding in the US, and Canada, shouldn't be that much different?
Ride Free, Ride Safely, Ride Everyday!
Merlin