Update by user Jun 11, 2013
UPS did respond to my complant and credited my account for the contested upcharges. I am happy with that and have since adjusted my dimension-measuring approach so it does not happen again. Thanks to all who provided perspective on this.
Original review posted by user May 11, 2013
Just received a nice note from UPS indicating that after auditing the dimensions of two boxes I shipped they were adding a surcharge of $21.44 to my Paypal account for being off by 1 inch in the box size dimensions I entered for two boxes. Both boxes were standard off-the-shelf U-Haul electronics boxes packed normally - 20 x 20 x 12.
The UPS store I dropped them off at has a chance to measure them again as I dropped them of and confirmed dimensions. Now I get this "FYI" adjustment to my Paypal account of $21.44 - with no recourse as the boxes already arrived at their destination and cannot be remeasured (not does UPS offer a clear path to do that if I wanted to). So I am stopping use UPS and switching to FedEx, USPS etc.
BE CAREFUL if you use the UPS web service to print shipping labels - it appears they have a profit center going based on "auditing" the shipments and claiming different dimensions than what you entered. If you use UPS, do so from a UPS store - if they see a home-printed label they will tag the box for auditing.
Monetary Loss: $25.