User stories are a way of introducing a product or a feature in a way that is easily understood. They have the dual benefits of being all about your product and simultaneously all about your customers.
When we were launching Passle, Tom leaned heavily on the User Story theme by positioning us as the user in this SlideShare. It's a great approach in that it enables us to be authentic, to describe a problem in some detail and also to explain the solution.
What is a user story? User stories are short, simple descriptions of a feature told from the perspective of the person who desires the new capability, usually a user or customer of the system. They typically follow a simple template: As a , I want so that .