Have you been here yet, this looks like a really good site: www.fragilex.org I read there that 1/3 of people with fragile X also have autism, and that characteristics include stimming, hyperactivity, dislike of touch, poor eye contact, perservative speech, and mental retardation, and that despite their difficulties in social skills, they are very friendly and like interaction, have a good sense of humor and are really nice. And the characteristics vary quite a bit from person to person.