I have over a dozen feeders around my two yards - front and back - as well as the new crabapple and hawthorne trees. Most of my feeders have hulled sunflower seeds for fantastic energy without any residual mess, and I also feed Nyjer, cracked corn and mixed seed. Even more important than just feeding, though, is taking care of your feeders even in the harshest weather conditions - keep feeding trays clear and snow away from feeding ports and perches so the birds can access the food easily.
Every step you go beyond just feeding the birds can also help them survive these harsh storms. Keep a heated bird bath clean and filled for fresh water, and provide shelter in a brush pile, roosting boxes, or sheltered niches for roosting birds. You'll be rewarded as even in the most wicked part of winter, your yard is alive with energetic, healthy birds. I know mine is, and even on the days when the weather keeps me indoors, I am able to enjoy that touch of nature as my birds flit back and forth through the yard.