I did it!
I've been "bike" commuting for about three weeks now, twice a week. I usually bike to my local grocery store, put my bike on the city bus bike rack (every bus in Ann Arbor has a rack, which is nice), and take the bus downtown, where I get on my bike and ride to class/work. It's not much biking, but it's nice to pick up the bus and not have to deal with traffic/parking.
After work today, however, I was riding to the bus stop I usually wait at, when I decided to go ahead and try the full monty. I started out toward home at 5:00 p.m. and got home at 5:25! I couldn't believe how fast I got home; it usually takes me 10-15 min. to get home by car, and 30-45 min. to get home by bus/bike combo.
My only complaint is that it'll soon be too cold to bike without several hundred dollars worth of gear, and as a college student, I just can't afford that.