EWG's 2011 list of food that you should always buy organic because of high levels of pesticide in and on the produce...
1) Apples
2) Celery
3) Strawberries
4) Peaches
5) Spinach
6) Nectarines
7) Grapes
8) Sweet Bell Peppers
9)Potatoes
10)Blueberries
11) Lettuce
12) Kale/Collard Greens
Eat your veggies!