Several people at the conference last week asked me for more information about how to write user stories. I could write a long blog with lots of examples and explanation, but someone has already done that. Check out Scott Ambler's post here.
While Scott recommends capturing stories on cards, I like to capture them initially in a spreadsheet because it makes it easier to organize and prioritize. Once the project starts I print out the cards - instructions are in one of my earlier blogs.