If you're not getting any eggs this time of year, and want some, the only thing that works is a little artifical light. I've read that chickens need 14 hours of light to continue laying regularly. I use an energy saving bulb in a "vapor fixture". You can buy them at home depot in the lighting department (in the section where they display the "shop lights" and other commercial fixtures). They run $25 and that includes the waterproof workbox they mount to. It is a very safe design that can be used in wet or exposed locations. The bulb is held inside of a heavy glass jar and the jar itself is protected by a sturdy metal cage. Very tough. I was also thinking those plastic tube lights would work too. They come pre-wired - all you need to do is plug them in. String them aroung the ceiling of the coop on cup hooks and they should work fine. They sell a plastic track that the tube lights snap into too.
With sunset around 4:15 now. You can use a timer to turn the light on around 2AM and off by 7AM. Better to use the light in the morning rather than the evening. With the 13 watt energy saving bulb the power cost is minimal. I'm still getting between 10 and 12 eggs a day from 15 layers. I figure if I'm going to continue feeding them through the winter, they need to keep laying eggs. It's a mutually beneficial arrangement!