UXDers often rely on personas to build a more complete understanding of the types of users that will interact with the applications they are working on. Writing the stories for those personas used to be hard for me until I started using other stories as inspiration for them.
This is a completely unscientific, highly incomplete look at some of the personality types you find in communities, online and off. Think about how these and other stories might be used as the basis for your persona development.
This was a 5-minute lightning talk for Webstock Mini (http://www.webstock.org.nz/birthday.html) and updated to a 10-minute talk for UX Australia 2009 (http://www.uxaustralia.com.au/conference-2009/10-minute-talks).