A functional version is out there in the world. You can play around with it. packmapr.com. Now it works with USPS, UPS and FedEx. I have set up the RSS feed for FedEx because it was the easiest. but will not talk more about that until i get the others working as well.
I have made it so that anybody can go to packmapr.com/ followed by their tracking number and it will automatically do all of the work. I am pretty pleased on how this worked out.
So take a look. Below are tracking numbers for USPS, UPS and FedEx