Mutsy - You know there is a support group for families that have children with ADHD. It is called CHADD and they have chapters all over the country. The nice thing is that they have outings where children with ADHD can play with other children with ADHD and make friends.
Often children with symptoms of attention deficit hyperactivity disorder are very impulsive and their energy level is too much for the typical child sometimes so they do suffer from a lot of rejection from other kids.
This group also has an online forum that allows parents to talk to other parents with children that have ADHD and discuss their challenges and things that work for them. When you realize that a whole lot of people are in the same boat as you it makes you feel better and you are in a better position to help your children.