I agree with TheChubu. This interest in asperger's is becoming the next "ADD". I think this is just a sign of the age we are in. Technology is more integral to our lives than ever before, and so lifestyles are changing because of it. Our brains change as a result of our lifestyle and the activities we choose or choose not to participate in.
As a loose example to explain what I'm trying to say, not too long ago we believed that there was a part of our brain that allowed us to recognize human faces. As it turns out, evidence today suggest that this is not the case, but that we are able to recognize human faces simply because we are always around other humans. Our brain adapts and allows us to recognize subtle facial details among different people. This explains how a person can have such an easy time differentiating between different people from their own race, and yet have such a difficult time telling people of another race apart. It also explains how a car enthusiast can easily differentiate between cars of different models/years, or the fact that we can see faces in cars. (Haha, I kind of went overboard with my example.)
Anyways, I'm not saying I'm correct in this issue. I'm just proposing a theory based on my experience.