My commute is "going" to be between 22-25 miles each way, I'm currently working out route options and checking traffic flows. Currently (fairly new job) I'm working half-days on Fridays, so I'll start by riding in on Friday's, which will give me all afternoon to get home.
Between now and Christmas I'll be trying different routes on the weekends with either a road bike or a mountain bike. One route is mostly a rail-to-trails path, but with enough major arterial roadway crossings that I might be better off on the road bike on the road than messing with the pathway.
Why I'm looking at starting to commute to work in Wisconsin in the winter I have no idea, but having grown up in Washington state causes one to do stuff regardless of the weather.