The Complete Guide to Free Social Stories
http://www.oneplaceforspecialneeds.com/main/library_social_stories.html
From their website:
One Place for Special Needs scoured the Internet to come up with the most complete list of free social stories covering everything from behavior to toilet training. We also have included stories showing sequential processing, the steps for what to expect in a variety of activities. Some are text only and others include pics.
The Behavior Guy
Darren Tagliarini BCBA: A blog for parents and teachers of children with varying abilities.
A number of social stories helpful for parents of children with various difficulties.