Our problems over the years have been more that even if other kids share an interest, they are not as intense or deeply involved in the interest as D is. Harry Potter, Lord of the Rings, insects, etc... She would be so excited when another child would say, "Oh, I like <blank>, too!". Then she would proceed to blow them away with her trivia knowledge... and come away very disappointed that their knowledge was superficial compared to hers.
Some of her best friendships have formed online (she is 15 now, so we are about 10 years ahead of you
). Mostly with kids she met through various gifted/talent search/Davidson type programs. So I would encourage you to take your son to those types of get togethers/activities as he gets older. You might try Mensa (we have not, but others in our area have had good luck there).
