Had my first wipe out of this calendar year today. Winter's finally setting in. Cause? Black ice. Thought this might help you guys out, then.
If you live in a hilly area, slow down everywhere. Weather fluctuates greatly even with a 5 foot drop in elevation - I live in the lower area of town and needed to go somewhere where the elevation was about a couple feet higher.
The road looked wet, so I took care... but there was black ice where I was cornering. Watch out all the time, especially if you know you'll be travelling in "flat" areas or hilly areas. If you're going downhill, the conditions should improve as you roll downwards.
At this time of the year I suggest you don't clip in, as clipping in makes the ride a little more dangerous. My fall today broke my cages and straps because I was trying to get out so desperately as I went down.
Back wheel sliding isn't much of a concern as front wheel sliding. Why? I can't explain; trust me it just is. (Someone helpful will explain it below! ) Use your back brake more than usual and only feather with the front break.
Be safe out there! I don't want anyone else to wipe out!