As you know, there are plenty of tools to keep track of shipments that are shipped with UPS. There is an app called Delivery Status which even recognizes an UPS shipment by just copy and pasting the tracking number into the app.
I just noticed that iOS seems to recognize the shipment all by itself.
In iOS Mail (iOS 5.0.1) every number is highlighted to be called as a possible phone number. But in this case the number was my UPS tracking code. Upon tapping the number I got the options to either copy it or track it.
By tapping tracking it opens an ups site with the tracking number already applied to the script so that you can see the status of your shipment. Ergo no need to copy and paste an UPS tracking code to any other program or the UPS site itself.
[crarko adds: I tested this, and it works as described. As mentioned in this previous hint this was a new feature in Mail with Lion. This hint confirms it for iOS 5 Mail as well.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20120123111258843