Above all resist the urge to over-correct. If you try to start from a stop and the car doesn't seem to go, don't stomp on the gas, you'll just slide around. Same thing with turning. If your car doesn't turn, straighten the wheels out and they are more likely to grip.
When you get home/to work, make sure to knock the ice boots off of your car. That's the buildup of ice/snow/road gunk that builds up in the wheel well. If you do it after you driven it will be loose and probably just fall off. If you wait until its frozen solid, it'll be frozen solid and could limit your ability to turn your car (it will buildup on the inside part of the wheel well and limit the steering angle you can achieve).
Make sure to clean off all of your windows, mirrors, lights (and to obey state laws: your license plate) before you go anywhere. Too many idiots driving around today, two days after it snowed, with windows still blocked.
If you haven't already, get snow tires. If you have been driving in the snow for years they approach being optional, if you have limited/no experience in the snow they should be pretty much mandatory.
Don't know if its obvious or not, but on the back side of most ice scrappers are little ridges that look a bit like knuckles, those are for scraping ice buildup on your windows. The blade is better for frost and a brush works best for snow.
While you are at it, its probably a good idea to clean off the roof of your car. It sucks when you get a couple inches of snow, start driving, come to a stop light and all that snow slides forward onto the windshield, you turn on the wipers to clear it, but its too heavy for the wipers and the fail safe bolts release and now your wipers don't work at all.
