Well, everyone on the ADD board has at many times complained of losing their car keys all the time, not remembering easy things, etc. and somehow that is considered ADD trait. But I read recently in a magazine that losing car keys is not really abnormal; that our brains have too many things to remember so sometimes it isn't so easy to access every detail all the time.
The article really had to do with people's fear of getting Alzheimers, but the key thing is mentioned so many times here I thought it was appropriate comparison. So the article mentioned one very helpful suggestion, it said blood flow and oxygenation to the brain is very important for concentration and memory.
It suggested that regular aerobic exercise would be helpful in that area. I would think it would also help some of the ADD traits. At any rate, I think it couldn't hurt!