Thanks all for your guidance, support and for the great links. I do have the intensity book; I think I need to re-read some of the chapters! Momtofour, MON, your suggestions are really helpful - will keep those mind. I do have a problem getting him to stop the activity though (will refuse to give up), which makes it all even more difficult but I have found that sticking to your point #4 does help.

Yes, I am going to start searching for a therapist to him and also to help deal with our sometimes tense family dynamics due to our kids intensities (actually DH too). Problem I have had in the past is that the therapist just did not get my DD's gifted intensities and it sort of backfired and made her feel awful about herself. We don't have anyone who really has a lot of experience with gifted children in our area. Perhaps I need to contact DYS consultant for suggestions.
Thanks again for taking the time to respond.