The new Primus ETA pots look awesome for snow melting -- 1L, 2L, or 3L at *reasonable* weights. They include a jetboil-style "flux ring" on the bottom to speed heating.
If you believe the Primus hype, they increase efficiency by 50%. I'm waiting for someone to try out the 2L and report back.
Since snow melting involves so much energy transfer, the savings of "efficiency adders" like flux rings and outback oven tents become net gains much more quickly than on a summer trip.
Primus also has an all-fuel version of the ETA stove coming out in January. It's like the one Roger reviewed (hyper efficient, low CO) but it accepts white gas and diesel/kero as well. Sound like a perfect high-efficiency, set-it-and-forget-it winter stove.
PS I always wondered why the MSR Titan pot (8oz.) sells at all, when the AGG 2L pot is 6oz. Have I got those weights wrong?