A.R.
That sounds a lot like my 6 year old. He's never been tested for ADD, but his dad has it so we know some of the coping mechanisms.
We really didn't want to do any type of medication. We decided to start by modifying his diet. Basically we will be eliminating dairy, fried food, and red dye from his diet for a couple weeks to see if there is any improvement. Then we will slowly reintroduce foods - if he has problems we'll know it's the food.
One thing we've done this week that seems to have helped a lot is to give him a small (2oz or so) cup of sweetened iced coffee every morning. For kids with ADD caffeine has the opposite effect as on a 'normal' brain, it calms them. Last week he got yellows and reds (very poor behavior) all week at school; this week he's had all greens and a cup of coffee every morning.