it really depends on the age range you are looking for..
adults: "The Asperger Love Guide: A Practical Guide for Adults with Asperger's Syndrome to Seeking, Establishing and Maintaining Successful Relationship " ISBN 141291910X
Teens: "The Guide to Dating for Teenagers with Asperger Syndrome" ISBN 1934575534
plus possibly general socialising but this one is aimed at adults
"Asperger Syndrome and Social Relationships" ISBN 1843106477
I hope these help, if they arent exactly what you are looking for contact me with more specific details of what you are looking for and I'll see what i can find.