Google Mail

Last Saturday, I received an email from Amazon informing me that my order had shipped. The email gives you all the pertinent information including a tracking number. Yes, I was being miserly and chose the free shipping option which enabled Amazon to pick the least expensive way (and slowest) to ship my order...the United States Postal Service. Anyway, I just noticed that Gmail put a link on the right to track my specific USPS tracking number mentioned in the email. Very useful and clever. I guess I didn't notice it before because that's where Google normally puts its relevant text ads. All this would be perfect if the USPS tracking site updated its information in real time instead of every evening. Is that asking too much?