Why Buy Organic?

Once a week (or at least once every couple of weeks), I want to highlight certain foods that you should indeed go out of your way to buy organic, either because they're customarily genetically modified or they're grown using pesticides and tend to end up with a lot of residue. I figured that I'd use this to educate myself, as well, so that when I do my own shopping, I'll know where to best spend my organic dollars. My eventual goal is to create my own little shopper's guide to haul with me to the stores. I'll start with foods that I eat most often or that other vegans might find ending up on their own plates more often than not. I should have my first post on this over the next 24 hours. All feedback and questions will be much appreciated.