A commute is not a race. Slow down. Cool down on the bike by rolling along for the last few mintes. If you are too hot, chuck some water over your head.
Use the most puncture resistant, medium width, slick tyres you can find (Specialized Armadillo). Carry a small puncture repair kit.
If the roads are wet, the fenders will keep you clean.
If you are carrying a heavy load, consider letting the bike support the weight. Fit a rear luggage rack.
Ensure that you have lights and reflectors. Wear a helmet, gloves and bright clothing for protection.
Ride like a vehicle.