Pete Zimowsky, the Idaho Statesman's outdoors reporter, describes his winter riding experience HERE.
Apparently his commute is about 15 miles round-trip. Pretty impressive in the winter. (His good fortune is that most of it is apparently on the dedicated greenbelt. I feel MUCH better when bicycling in the nasty stuff, when I'm not also worrying about getting creamed by a 3000-pound, sliding-out-of-control steel missile.)