I rode all winter, like usual. Actually, February was the best part of the season, with a few weeks of good riding days out at the Hydrocut (my local trail system).
I used studded Nicotene tires for the first time, both commuting and on the trails, and they really impressed me.
This wet season is my least favourite part of the year -- I'll be away from the trails for at least a couple months before it gets hot and dry.
All in all my winter commute is pretty easy, but the daily dose of road salt leaves my bike nearly disintegrated at the bottom. I'll be in for another big maintenance bill this April.