Be VERY careful reading into the news and hype about this story. Yes, there could be a link......but, it was a small study that needs a follow-up with a larger sampling of children to really understand the impact of organophosphates in connection with ADD/ADHD.
Organic produce uses pesticides, too. The EPA & USDA have several pesticides registered and certified that work differently than the ones mentioned in this article, malathion specifically.
Not all pesticides are neurotoxins. Be careful of the sites you derive your information from. Check with the EPA and USDA for information as it's required to be fair balanced. Check with your state's Departments of Agriculture as well to really understand what pesticides are being used for things like mosquito control and end-up in the air/water supplies as well - not just used on produce.
There are pesticides that the government has approved for Organic use. DowAgroSciences, for one, developed spinosad which is certified for organic use: http://www.dowagro.com/turf/prod/spinosad.htm
Most importantly, ask your pediatrician what they're opinion of the study is. They may have a different take on it after reading the entire study in "Pediatrics" vs. what the media has reported.
As much as this is important information regarding our children's safety, it will be a while before we really fully understand the possible implications of this particular class of pesticides (organophosphates) vs. other pesticides available.
I'm a huge fan of Farmer's markets. Ask the growers what they use to treat their produce, and always thoroughly wash any fruits/vegetables thoroughly.