My 10-year-old Aspie son's teacher gave me 30 minutes to talk to his class, and my son says it has been very helpful. I started out with asking the kids to tell me things where people can be different, and wrote them up on a whiteboard (things like color of hair, some people like Star Wars, etc.), and then I told them that Ian was different, too, because he has AS. However, he is also very much the same. What are some of the things that make us all the same? Then the kids volunteered answers, and I listed those, too. Then I told them that Ian even though Ian had AS, he was just like them. Then I told them a little bit about AS and what it is like to have AS. Then I asked the kids the kind of things they like and what makes them happy. Again, we made a list, but this time I made sure that the kids put on their list "having friends". I went through each item on the list, one-by-one and said (for example), Ian also likes swimming, Ian also likes to go to Disneyland, etc. Then I paused at the last one and said, "And Ian also likes to have friends." I was silent for a moment, and looked at each child in the class, and you could see them "get it." Then, at the very end, I made a list. I wrote down the names of Bill Gates, Dan Akkyrod, Abraham Lincoln, Michaelangelo, and Einstein, then asked the kids who these people were. Then I asked what they had in common. No one knew. And I said, "they are all great people in history who have accomplished great things in life and for our fellow man, and they all have or had Asperger Syndrome --- just like Ian." You should have seen the looks on the faces of those kids - pure amazement.
Again, Ian says it really helped him. He says kids offer to help him with things, and they ask him to play while he is on the playground. And these are things that were not happening before I spoke to his class. He has also asked me to talk to his cub scout group, although those kids already accept him for the way he is so I don't think I will, but the point is, he is glad that I did it, and wants me to do it again. And if it helped him, then I feel good about doing it.
I don't know if this helps you or not, but I thought I'd give you my two cents.
Good luck!