My best winterhardy egg layers are the Brahmas, Easter Egger, and Sex-Links. The Brahmas seem to take the weather the best though. I would say if you are looking for very hardy winter fowl you would want to looking Brahma, Easter Egger, Chantecler, Wyandotte, Buckeye, Dominique, and Silkies (but they don't handle getting dirty, and wet as well).
If you want just want winter layers, but are not the most cold hardy thing on the block then almost all dual-purpose breeds would apply. Stay away from those thin Mediterraneans like the Leghorn, and you should be good.
Good luck, and hopefully some eggs soon. You may also want to keeping a light in their coop for a few of the darker hours, to help encourage them.