It's a great start. I'd like to see a discussion of the different tires and techniques for other winter conditions - ice vs. snow. Your article focuses mostly on snow riding, but in the Mid-Atlantic, at least, ice is more prevalent. Perhaps links to Icebike and Peter White would suffice.
Also, I disagree with your statement that WD-40 should not be used on chains. I use it all the time to allow the oil to penetrate into the links. After cleaning the chain with mineral sprits and applying Prolink lube, I spray with WD-40, wipe the chain thoroughly, and let it dry for a while. It works great.