I am thinking that a good quality 28-105 lens would be the way to go. Would that work for general on-snow shooting? Either that, or the 35-105 that Nikon makes. There are also f/2.8 versions from Tamron, but I am concerned that they would be a bit large for skiing with. I was thinking more along the lines of the "consumer" Nikon f/3.5-4.5, or the f/4 Canon L IS 28-105 lens.
Would I also need to carry around a bigger Canon 70-200 f/4 (or 80-200 f/2.8 in Nikon's case) for some shots? I have had the Nikon 80-200 f/2.8 D IF-ED lens, and while it was great for shooting action sports, I wouldn't want to ski around with what amounts to a quart-sized Thermos. Seems like an advantage for the Canon lens here, since it is still sharp and a lot less expensive.
What on-snow shooting tips have you generated over the years? The only one I specifically know of is adjusting for f-stop.