I just posted a new Social Story that I wrote for a few of my students. One of them likes it so much, she asks to read it every day. We've been having fun practicing greetings after reading the story.
Here's a link to the story: http://www.positivelyautism.com/downloads/SocialStory_SayingHello.pdf
You can find Positively Autism's other Social Stories here: http://www.positivelyautism.com/free/09social.html