I broke down and bought an iPhone last month. The manager at the AT&T store made sure to let me know that they are striving to improve their customer service. 

This "Welcome to AT&T" letter at first glance seemed to be part of this initiative. On closer review, I realized they're just trying to upsell me an even more expensive package.
 
"Dear Brenton,
 
I am delighted that you're an AT&T customer. Now that you've had a chance to get to know us and become familiar with your new phone, I'm wondering: What else can we do?
 
Here are a few suggestions I think you might find helpful."
 
- insert three paragraphs of blatantly self-promotional advertising here -

Before services like Google Maps, potential customers often relied on the phone book to find a local vendor. If someone was in the mood for pizza, they'd look one up in the yellow pages and place an order. You'd have the whole market to yourself if you could get the other guys out of the phone book.

A Gardnerville, Nevada pizzeria was able to do just that, by trading any customer a free pizza for the competitor's listing.