This is the most useful use of Augmented Reality I've seen to date.
This is a great idea. But I wonder why USPS uses a different domain for this. Seems like a legitimate domain because there's a link to prioritymail.com from usps.com also. But having two separate domains could be confusing to customers, I would think.
I don't know. But I suspect that priority mail is the most profitable part of the service - maybe they are trying to raise its profile?