I'll commute year round w/ studded tires once the snow and ice accumulate, but that's a fairly short ride. I have an old wind trainer at home, but these last couple of years I prefer to use the spin cycle at the gym. It's damn boring and doesn't give me the same pleasure as riding on the roads, but it's a workout. My main form of exercise this winter will be to run, which I will do in temps down to the teens, or I'll run in the indoor track at my school (where I mostly do speed intervals). None of this will make me be in great cycling shape come March, but the improvement curve will be a bit less steep.

Neal