Here are several examples of good nonprofit storytelling.
National CASA effectively uses video vignettes with both children and volunteers. The site also features some written stories, and while still good, they aren’t nearly as moving as the videos.
Interplast. Their blog contains wonderful stories about how their teams are repairing cleft lip and other birth defects around the globe. Lots of great before-and-after photos that really take you into the lives of the people they are helping.
Covenant House California, a homeless shelter for youth, features multiple success stories right on the home page. Each story explains the specific challenges the teens faced and how Covenant House helped them regain control over their young lives. Covenant House clearly inserts itself into each story, but leaves the teen as the central character, as it should be.
DonorsChoose obviously has great material to work with — who doesn’t like helping little kids learn? — but I especially like the way that this organization offers both short case studies and quickie testimonials.
Kivi's Delicious bookmarks on nonprofit storytelling (examples and how-to articles)