These are my son's special interests:

* Youtube - mainly videos that look like they have been made by kids about his age. The ones he really likes are the videos that pop up when you search on "Thomas the tank engine accidents happen". He also gets into really bad videos made by kids involving ridiculous adventures with their toys - like battles between action figures and toy dinosaurs, complete with voices and sound effects.
* Cars - has been an obsession since he was a baby. I think "Mercedes Benz" was one of his first words.
* Crashes - anything and everything to do with car crashes, train crashes, airplane crashes. His favourite TV shows are Air Crash Investigations.... Seconds to Disaster.... Mythbusters. He draws really elaborate and detailed pictures of crashes. His toys don't generally last long because he plays crashes with them endlessly. He borrows my wife's handphone and makes videos of his cars crashing.

My thoughts are that I might buy him some kind of cheap video camera and get him started making his own youtube videos. I'd also like to get him interested in some field of science - he is bright enough to look things up on the internet. I could buy him some books on astronomy to get him started, then maybe a telescope. Maybe get him into some computer programming - maybe not just yet (he is 6), but in a year or 2.

Is it worthwhile trying to direct an aspie kid's special interests towards something constructive? Or is he best left to his own devices in that regard?