Winter Composting, Anyone?

I'm curious about what other people in cold climates do about composting in the winter. We don't have any kind of fancy composting system - just a compost pile surrounded by a mesh fence. During nicer weather composting is easy - we just make sure everything eventually breaks down. I always get frustrated during the winter because we can't use the compost pile when the ground is frozen. I know there are churning barrels and similar appliances designed for year-round composting, but I would love to hear other ideas. What works for you?