1) I over-prepared and am glad I did, but will eliminate half my gear next year.
2) Keeping your water liquid is an ongoing effort but is not that difficult if you have fuel
3) Managing night-time exhaled moisture is something I need to work on
3a) Ice-cold water dripping from your bug netting into your eyes wakes you up fast.
3b) What was I doing with bug netting at sub-freezing temperatures, anyway?
4) Site selection is not only key, dense brush can save you (or your toes) in heavy winds and sub-freezing temps.
5) Alcohol stoves DO work in winter! (I knew you were right, Doctari)
5a) But gas stoves pack a lot of BTU's!
6) Neos overboots are AWESOME
7) OR Meteor Mitts are AWESOME
8) JRB Down Hoods are AWESOME (but I can't hear anything with it on )
9) Walking in snow, esp postholing through crust, is exhausting, but floating over it in snowshoes is heavenly
10) Pulking beats packing a heavy pack
11) You need to eat, and eat often, before you become hungry
12) Grayson Highlands is a beautiful place, and the staff is great.
13) Hammockforums is populated with the best, friendliest, most talented, helpful and generous people.
I'm sure there's more, but that's what is coming to mind right now. I may add some more later.
If you were there, please feel free to add your wisdom learned in the Virginia snow.
Here's a vid of my sleep system on the trip, if anyone is interested. It worked out well.