Alternatively, not having any equally smart kids to talk to will force him to read books and/or go online for interesting ideas and conversation. I don't think I had any really interesting real-life conversations until college, when I did an internship at Microsoft Research, and I'd like to think that I turned out fine.

My favorite book, BTW, is A Fire Upon the Deep. But one of the reasons I like it so much is that I was heavily into Usenet when I first read it, and I'm not sure that aspect of the book will resonate as much today. (I was determined to become a one-man Sandor Arbitration Intelligence. :)