Among the suggestions from Gizmodo are the inclusion of snow studs on your tires, they recommend a set from Schwalbe that run $78. They also give the thumbs up to a powerful light from Cat Eye and a hydration pack from CamelBak. Of course, the most important thing is to stay warm however, and for that they recommend starting with a pair of Snowpocolypse pants from Mountain Hardwear.
The list only contains seven items, so it is far from comprehensive, but if you're someone who loathes the end of the cycling season, and wishes you could ride all year long, it is a solid place to start. For me, it all begins and ends with the clothes you're wearing, so don't scrimp on base layers, cycling jackets, and so on. It'll make your cold weather rides much more enjoyable.