One of the big banks (BOA, Citi?) was recommending folks to hit the ATM's in front of the storm due to the likelihood of a power outage and peeps needing cash. If you always pay with plastic, it still makes sense to have cash around as a back-up.

Other than that, top off the fuel tank and hit the grocery store, before the roads get to the point that driving is not an option. Do all that ahead of time and then you can enjoy the snow.