More people now visit Apple's 326 stores in a single quarter than the 60 million who visit Walt Disney's four biggest theme parks last year. Why? The 2007 employee training manual outlines the steps, which handily spell out APPLE.
Approach customers with a personalized warm welcome
Probe politely to understand the customer’s needs
Present a solution for the customer to take home today
Listen for and resolve any issues or concerns
End with a fond farewell and an invitation to return.
For details here's an interesting article from TUAW and one from Forbes blogs.