Subject says it. What is it to you?
Is it a MTB with slicks? Is it a simple road bike with fenders? So, if you would fill in your answers to these questions maybe we can get a good discussion going

Feel free to post URL's to your suggestions.
The only requirement is that it has to be an all-weather bike.
Frame type. Road? MTB? Hybrid? Specific model? New? Used?
Wheel size. 26"? 700C? other?
Tire size/type.
Drivetrain. Single Speed? Fixed? Derailer? Geared hub?
Brakes. Standard caliper or V? Discs? Coaster? Drum?
Storage: Rack+Panniers? Baskets? Trailer? Xtracycle?
Pardon me if I forgot anything!
Part of my motive is to get a nice thoughtful discussion going, but part of it is selfish too

I want to build myself a new bicycle for commuting and general city riding this winter.