I've fully adjusted to riding in the dark again in the mornings. Takes a while, just like adjusting to riding in the cold again. I mounted my Superflash tail-light on a seat stay to make room for another tail-light on my seat bag. Put some new tires with reflective sidewalls on my commuter for increased visibility from the side. Got out my vest, long-fingered gloves, arm and leg warmers.
Also started noticing last week a drop in my average speed. Must be the heavier density of cold air because I don't think the warmer clothes could slow me down that much.