David Olson: "Cut down dump truck chains will get you through
snow pushing on the grill." Really? That sounds like fun, except that it'd probably destroy the front of my car's sheet metal(i.e. plastic).
Snow tires: When I tried Nokian Hakkepelitta, they worked well on snow and ice but wore strangely on dry pavement, causing a vibration. Bridgestone Blizzak is what I use now, much better traction on snow or ice than all season tires. The Tirerack website has tests comparing brands of winter tires and comparing winter tires to all season tires. It is interesting that in their tests a 2wd car stopped faster than a 4wd on ice.
http://www.tirerack.com/tires/tests/testDisplay.jsp?ttid=103
http://www.tirerack.com/tires/tests/testDisplay.jsp?ttid=167
Clearance: This is the main limitation with my FWD Honda Fit. The only time I've gotten really stuck with the Fit I was hung up on snow just a little too deep.
Winter in upstate NY driving an Alfa Romeo was interesting. Rear wheel drive, but with studded snow tires on the rear it was pretty good on snow/ice. It would start reliably at -20F, unfortunately it would get to -30F there. The defroster was completely inadequate — it was great fun driving with the window at 0F to keep the windshield clear.

