I ride my Atlantis all winter long, no problems at all. I might get a touch of surface rust here and there on a steel bolt, or bit of exposed frame where the paint is worn off, but it is so thin it comes off easily. I should apply a new layer of frame-saver this fall though. Don't want a surprise hole appearing from the inside.
I believe that if you have good quality components, they should easily last the winter. I have a Phil rear hub, SONdelux front hub, Phil BB, XT derailleur. All those parts handled the winter no problem. And I've got a real NASTY winter where I'm from (Winnipeg, Manitoba. Winter is six months long, dips down to -40 for a while). I always lock my bike indoors as well, so there are many melt/freeze cycles happening. Giving the bike a good shake before bringing it in (or brushing the snow off with a nylon brush or something similar) is a great idea. The riv's are real tough, don't be afraid to get it a bit cold!
