I have some references for books or CDs that target social behavior in young kids.  There are also books that address the anxiety that is frequently co-morbid with Asperger's and helps give kids a sense of control over feelings that sometimes feel out of control (not sure if your munchkin is experiencing that).  The approach is to break down social skills like a task analysis, and then address areas of weakness through explicit teaching.  There's one song that goes, "People like it when we say hello. Hello!" and so on.  

I don't know if Asperger's is part of the picture or not in your case, but I think the skills-training approach can be helpful for lots of kids on and off the spectrum.

Hope this doesn't come across as pushy. I can get a little over-zealous :)