The four main points are:
Obsess Over Customers. While they pay attention to the competitive marketplace, they don't let competitors determine what they do. Instead, it is the customer that drives their strategy.
Invent. A critical part of what Amazon does is to invent solutions for, and on behalf of, their customers.
Think Long-Term. Amazon strategists take a long-term perspective. They are willing to take actions that quickly offer benefits to customers, even if those actions don't offer a pay-off for the company or its investors for five to seven years.
It's Always Day One. There is always a bigger future and more opportunities to invent for customers. It's never over, or too late.
Yes, it is a simple list. Still, it is worth watching.
It gave me a sense that Amazon not only preaches these principles, but practices them as well.
Also, here is a link to Zappos' CEO, Tony Hsieh's letter about the acquisition.
And here is a link to Four Questions About the Acquisition.