Looking to boost commercial use of First-Class Mail, the US Postal Service this week launched its new "2nd Ounce Free" pricing program that enables direct mailers to send letters weighing up to two ounces for the one-ounce postage rate. The USPS said the new pricing strategy will enable high-volume commercial mailers to get more out of each mail piece by letting them add additional/operational content or letting them experiment with heavier paper stock or larger envelopes for greater impact....