Caring for Rims in Winter Time (Winning the battle against Salt!)

[skeck]

Looking to find out what everyone does for their rims in the winter time, for those of us who live in snowy, salt on the road areas?

Do you switch rims in the winter?

Do you just protect your current ones and if so what do you use to do so and how often?

Or...Do you just do nothing and you have never had any issues?

Thanks!