The New York Times did an interview piece with fashion icon Michael Kors and famous restaurateur Danny Meyer. (You can read the whole interview here.)
Danny summed up great customer service in one line...
"Great hospitality is taking however we three felt before we came here and making us feel a little better when we leave."
Are you making your customers feel better than when they came in? Do that one thing consistently and your business will grow.
PS Here are some ideas for things you can do that will definitely make your customers feel better.