In the enlarged picture, notice the little "Would you like to..." box on the right? That's right, they recognize and parse out the tracking number from the email and give you a direct link to the UPS tracking website. Something I noticed this morning (but didn't grab a screenshot of it) was the integration they recently added (it wasn't there a week ago) with google calendar. They scrape the tracking results for the estimated delivery date and allow you to create an event on your calendar directly from gmail.
They do this for FedEx and DHL (and probably others) as well.
I started tracking ups items through google when I found you didn't have to accept the terms and conditions required on the ups site when tracking, saves a mouse click, but so worth it.