This is my Winter rig. It is a 2006 Marin Novato. It has mostly stock components. Here is what has changed:
Planet Bike Freddy Fenders
Planet Bike mud flaps
Rack off of an old Diamondback
Diamondback trunk bag
Cateye Strada Cadence cyclometer
Schwalbe Marathon XR 26 x 1.6 tires
Tektro long pull front brake
Blinkie
When it is dark, I have a Nightrider TrailRat light.
Easton EC70 carbon fiber seat post
Brooks B17 saddle
Shimano SPD / platform pedals
I think that sums it up!