There was some old thread here where block and battery heaters were mentioned. Even mommasita (from Quebec) said she'd never heard of anyone who had one, although I suspect some did but never talked about it. A block heater isn't really all that much other than a tiny immersion heater. Unless there's some sort of auxiliary pump, it's only going to heat a small portion of the coolant. It's just a head start on heating, although I understand that many just use them to speed up the time it takes to have heat in the car.
http://www.disboards.com/threads/let-a-car-run-before-driving.3382066/page-3#post-53121736
Most modern motor oils operate at far colder temperatures. Heck - Honda and Subaru now mostly spec 0W-20 motor oil for the US and China, although the main reason is for fuel economy.
A few years back I was buying a car battery at Sears, and the online options said there were "north" and "south" versions optimized for either cold weather starting or to last longer in hot conditions. I just ordered the cheapest option and went to pick it up. When I got to the store there was only one version.