I posted a pretty crappy looking list a while back and I've had some time to test stuff out on several trips this winter. I also got a hold of a postal scale and some new gear. Here is a SNP/AT winter list with a 8lb base pack weight that has proven to be comfortable and easy to use (I'm pretty much a complete noob to a lot of this stuff: alcohol stoves, tarp, bivy, lightweight, etc).
Update: It was suggested that not everyone knows what "Shenandoah Winter" means meteorologically. Here is a brief description of the weather and my approach.
Avg Temps (F): 25-45
Edge Temps (F): 10, 60+
Avg Distance/Day: 10-12mi
SNP winters, as well as winters on the AT in general, can best be described as the temperature band that creates cold, wet, precipitation. At the very least, 2 or 3 times a month SNP sees a wintry mix, occasionally lasting for days at a time. Usually all this water will then freeze on everything, including Skyline Drive. Much like Virginia's roller-coaster-like weather, it will inevitably be 60deg the following day.
I try to avoid aforementioned rainy periods and backpack on weekends where heavy precipitation is not in the forecast. Although, this list is based on being prepared to handle a night of steady rain or snow fall.
SNP/AT Winter Gear List