I spray my feet with anti-perspirant before "socking up". My feet do not sweat and are warmer for it.
I wear a thin pair of glove liners, beneath my winter gloves, that wick away moisture thus keeping my hands dry and warm.
I apply Vasoline Intensive Care lotion to my legs, arms, face and hands prior to kitting up and going riding or running in very cold weather...it is -1f now and I'll be running for an hour in a bit...keeps my skin from drying out.