Every year it gets shorter and more refined. Mostly all city or residential streets, some multi-use paths on an especially busy (and shoulder-free) road.
I also tour with my bicycle. I'm generally not hardcore enough to commute in the winter (it's Minnesota, after all), but if gas prices stay the way they are, I may have to try (or at least extend my concept of "season").
There's an elderly gentleman who I meet nearly every morning, going the other way. I don't know his name, but I'm always happy to see him when I'm riding and am embarassed if I see him bicycling (especially in the late fall or winter) when I'm in my car.