Shopper's Guide to Pesticides (originally from Comestible Zone)
If you can only buy some organic, this is the list to go by.
You will have heard on the news this week that they have linked pesticide consumption with ADHD in children. Article here.
Organic tends to be more expensive. However, balancing that against consuming pesticides can be a juggling act between good health and expense. If I could afford it, I'd buy all organic.
You can print the list and take it with you grocery shopping.