Drawing the lines/getting an accurate diagnosis or finding there is no diagnosis is important, but the bottom line, to me, is getting the right help for a child. My ds8 does not fit any of the definitions of aspergers, high functioning autistic, etc., however definitely has social skills deficits - stuff he just doesn't know how to do, and also some social anxiety (mostly from having failed to do things right in previous social situations). Some of these skills can be learned, through social skills groups with other kids, one-on-one counseling, and other methods, so we are looking at the options right now.
The dual diagnosis/misdiagnosis book Grinity recommends is a very helpful read. I have not looked at the other book.