>Thanks for the thoughts, still considering hammock camping.
As you can see from my posts in this thread, I'm pretty happy with winter camping with a hammock. The weight may not be as light as possible (i.e., compared to a snow cave or floorless pyramid) but it's easy to ski/snowshoe over to a bunch of trees and have your shelter set up in ten minutes.
A cheap way to try it out is to get a Byer of Maine/Amazonas Moskito Traveller hammock, which can usually be found on-line for under $20. Put a closed-cell foam or inflatable sleeping pad underneath you, and you're set. It's not the easiest thing to arrange the pad, but if you like hammock camping you can switch to an under-slung insulation system. Be sure to sleep at an angle! I have a ruptured disc in my back, but as long as I sleep mostly flat in the hammock I'm fine.
I hiked the Wonderland Trail around Mt. Rainier in mid-September, sharing a tent. It rained most of the time and I had gone fairly light on my sleeping gear (GG ThinLight 1/8" with BMW TorsoLite). It reminded me just how much I dislike sleeping on the ground, even with Excedrin PM and Aleve.