Wet ice, what could be more slippery?
A layer of ice covered by a dusting of snow.
I grew up in a part of the country where the roads got a layer of packed snow and ice early in the winter that remained until spring. As a result I (and others in the area) got really good at winter driving.
My tips:
Don't do anything suddenly (accelerate, decelerate, turn)
Don't overdrive your tire's adhesion limits.
Concentrate 100% of the time on how your car feels on the road.
Adjust speed for the conditions (packed snow, loose snow, ice, slush, etc... each is different).
Adjust following distances for conditions.
If you do lose the back end turn into the spin (if the back end slides left turn left).
I still drive a mid engine RWD sports car year round. I'm the guy you'll see blowing by you at 65 while you're creeping along at 30-40 but sometimes not. I've never put my car in the ditch or been in an accident due to road conditions. I'm glad I got all that practice growing up.