A quote from the article:
Story mapping is a way of organizing Agile user stories that communicate user experience. It allows us to build the collection of stories that become the backlog. Agile expert Jeff Patton will show you how story mapping gives you a tool: a tool to both quickly think through and simply describe the user experience. This strong technique helps you put the big picture of UX and the little pictures of Agile in one place, engaging the developers and stakeholders you’re working with.
Users will always have an experience with your product. Story mapping will pull your UX focus into your organization’s process and ensure that experience is a great one.
The important thing is that we really do our best to understand what the users really find useful, etc. We need to understand how the application should work from their point of view too. Not just because we know some features will work well in a certain manner doesn't mean that we've made it in such a way that they will easily use the application.
It is a good question to ask youself: Have you mapped out the stories?cross-posted via posterous.com: http://eclair.posterous.com