There is a great post over on Fast Company's blog that looks at the negative experience often associated by customers with the check-out process...namely, how it comes last. They wonder:
"Our memories of an event are overwhelmingly shaped by its last moments. So why do so many services conclude with the worst part of an experience: Paying for it?"
They site some examples of several businesses that are reinventing the idea of the "check-out," including Apple.
You can read more over on Fast Co. Design here.