A great link was shared on the Boardmaker Group recently. This is a link to a great site for social stories. The blog that it was mentioned on is here at the Fruitful Prairie:
Fruitful Prairie - Social Stories
Which links you to the Kansas Autism Spectrum Disorders website. They have an entire section devoted to social narratives and power cards. They use many different characters (Dora, Thomas, etc...) to help teach students different skills. The files are available in different formats too - powerpoint, word, Boardmaker, and more. Check out this great resource for writing social stories.