A lot of people are believers in the 15% tire drop theory, which is supposed to give you the best mix of speed, comfort, prolonged tire life, and good handling (contact with the road).

Using the pressure calculator, which is derived from the above, and punching in 210 lbs on a 40%/60% front/back weight distribution gives you about 48 PSI in the front tire and 74 PSI in the back tire.

I've heard that 40/60 is more appropriate for road bikes, and a lot of commuting bikes are closer to 35/65. If you have such a bike, the math suggests that you run about 42 PSI in front and 80 PSI in back.

If you regularly commute with significant loads (bags full of stuff, heavy clothes, etc), then your riding weight will rise accordingly, and suggests a tiny bit more air pressure. And if your routes include lots of rough holes, potholes, curbs, etc., then you may want to consider running a little more in the front tire for extra resistance against pinch flats.