I have one of these on the front:
http://www.mec.ca/Products/product_d...=1201792777365
Regular knobbie on the back.

It may look like overkill, but that tire kicks ass.

I woke up this morning to 15 mm of frozen rain, i could barely stand up in my driveway. People at the bus stops where holding on to poles and stuff.
I rode 9 km to work no problem.

Forecast for tonight says 5 inches of snow.