I am a year-round bicycle user in Saskatchwan. My one-way commute to work is short (approximately 2), and requires 10-15 minutes in the summer, and 15-20 minutes in the winter.
My summer bike is a 1980s-style double-butted chromoly road bike that I picked up used from The Bike Doctor (a wonderful bicycle repair and retail shop).
My winter bike is a second-hand bike I received gratefully from an acquaintance. It is mounted with a pair of Continental SpikeClaw 240 studded tires, which I have found to be of tremendous value in maintaining my stability on packed snow and on the ocassional stretch of ice.
Below I list some resources I've found to offer much value.