Asperger's is at the high end of the autism spectrum, as I understand it.

It's popular among people ignorant of the illness to assume that it's imaginary, in much the way that people with asthma used to be told it was imaginary. Not helpful, honestly.

The most famous person with autism/Asperger's is
Dr Temple Grandin , who has made videos and written books about what it means. A bunch of her books are on Google Books if you want to take a look, as are plenty of videos of hers on Google Video.