I second the recommendation about cleaning the drive train. I fell down badly in that department last winter, and the price I paid was a whole new drive train (cog set, chain, rings) this summer. This winter I will pay more attention, and keep that drive train cleaner.
Another thing I plan to do is to use a wet-lube on my chain. Last winter I ran a wax-based lube, and I think that was a mistake given the general wetness that results from riding in snow.
Lastly, if snow builds up while the bike sits outdoors, take the time to brush it off. Or just pick up the bike and drop it on its tires a few times. You don't want snow melting into your drive train and causing rust.
I think winter is hard on bikes no matter what you do.
Are you really going to ride slicks in winter? No studs?