There are quite a few out there, as well as books on how to make friends, and how to carry on a smooth flowing conversation with total strangers. Some of them are ASD specific, some not. I found that fact pretty interesting when looking through them on Amazon.
I am guessing that it is for all kinds of people. People misread one another all of the time (which, ironically, I find it hilarious that it is part of the diagnostic criteria when I see misunderstandings on a daily basis when just walking around in the store). So I guess it doesn't hurt anyone at all to become a little bit more aware of others... but I've also thought "how can there truly be a GOOD book about this, as everyone expresses themselves differently?" I do think such a book could be helpful, but definitely not full proof.
I imagine that the ones geared to us specifically are probably worded differently, might be more visual, etc., whereas the others may be a bit more vague about stuff.
I am going to be ordering a few of them though, as I think they could be helpful, or at least interesting to read, and my son has been curious about things like that as well. So I will get one geared toward ASDs, and one that is more "in general", and let you know what the difference is
_________________
Sorry about the incredibly long post...
"I enjoyed the meetings, too. It was like having friends." -Luna Lovegood