Those of you with young drivers in the family, send them to a Street Survival winter school.
http://streetsurvival.org/ Best $60 you'll ever spend.
Those of you without young drivers, that's what CCA winter schools are for.
And yeah, always do all four corners, and skinny tires. My '98 Sport gets 185/65 in the winter (Michelin XIce2 in this case), versus 225/50 summer, and it is a little snowbeast here in Minnesota. And great fun with the AST switched off...