Hey - something I saw down in the states a few years back - I was in a Les Schwab store in Oregon, and they had a sign up, advertising that they would 'sipe' (cut slits in) your tires, for a price. This was billed as a good alternative to buying winter tires.
I've never seen that up here. Is it a common practice? Better yet, does it work?
(I always thought it was the different rubber compound that did the job - normal tires lose their pliability at about -12*C, while the wife's Blizzaks were still pliable at -25*c)