I agree for the rear, but I'm not so sure about the front.
Tire wear is a good guide to inflation pressure. If tires wear more in the center, then you can reduce the pressure for more even wear. If tires wear more on both edges, then you can increase the pressure for more even wear.
With lots of highway miles and/or relatively sedate driving patterns, the front tires have a tendency to wear the inside edge of the tire faster than the rest of the tread. This tendency can be reduced with the alignment (by reducing toe) but I think reducing the pressure in the front could make this problem worse.
That's why I would be hesitant to reduce the pressure in the front for those who don't drive their cars with gusto.
[This message has been edited by nsxtasy (edited 05 February 2002).]