Here is my commuter. It is a Giant Kronos I bought in the late 90s for a charity ride from Mpls to Chicago. I haven't ridden much since then, but I have commuted once a week since bike to work week in May this year. The total one-way distance is about 13 miles, but I ride the light rail for the middle five miles. Last week, actually, was the first time I have ridden the whole way. It felt great. I guess I'm getting stronger. I might be able to skip the train and just pedal through from now on.
I don't know much about bikes, so I can't tell you about the parts. I've added race blade fenders, one of those little pumps, a rack, and banjo brothers saddlebag panniers.