Well I don't store my lenses over winter, I keep using them. But even in my day to day storage I do a few things to insure that they are kept in good condition.
First off, I always keep a silica gel canister with my lenses (and camera) - These control moisture and all that comes with it (mold and corrosion) I have several of them - one in my camera bag - two in a cabinet where I keep other less used lenses. These metal canisters recharge in the oven and last forever (or so I've heard). Well worth the cost over time.
Secondly I try to keep my equipment cleaned - If I've been out shooting in a not too nice environment, I wipe everything down with a damp cloth prior to putting it away. Beaches have salt spray - dirt roads have dust. Both can be killers.
I assume you are at least keeping the lenses indoors where there will not be extremes of temperatures.
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