I'll be a tad bit more specific

3 season, with trees:

Homemade Speer type hammock with MEC silicone scout tarp (top)
and a 27inch wide wal-mart CCF pad in the hammock.

I add a Integral Designs Silponcho *underneath* the hammock as a windblock/insulation shell.
I then in colder weather add, progressively, A) folded crinkled space blankets as insulation
B) a 1 inch thick layer of poly batting in the shape of a hammock bottom. The effect of adding
both is to effectively make an undequilt for the hammock. But I sleep in the hammock fine
with just the ccf pad, poncho and no insulation down to just below freezing. (did it on friday night!)

WINTER

crappy green dometent, with BA insulated Aircore + ccf pad + 25" wide ensolite pad.
dome tent freestands on snow decently, and deals with snow load well.

Of course that's if I'm carrying it. If I don't have to carry it, in winter it's a 12"x12" wall tent with a GSI metals airtight stove in it <img src="/forums/images/graemlins/wink.gif" alt="" />

If I was made of money I'd buy a Kifaru or TiGoat rig for winter though!