Look no further than these websites for some great nonprofit storytelling. Tell me about your favorites and if I like them too, I'll add them to the list.
National CASA is my current favorite. The video vignettes on the homepage with both children and volunteers are incredibly powerful, in a very short amount of time. 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.
ONE Northwest, a nonprofit that helps other nonprofits with technology needs, shares several client stories. While these don't fall into the "touching" or "inspirational" category like those above, they do clearly show the difference they are making for the organizations receiving their assistance. If you do capacity building or provide services to other organizations, rather than individuals, you'll find yourself telling stories like these.
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.
Robert Wood Johnson Foundation Local Funding Partnerships website shares stories from a variety of community-based organizations that have received foundation funding. The foundation paid for storytelling training with Andy Goodman, so you'll find some really well-developed and crafted stories here.