The newest acronym on my lips lately is GMO, which stands for genetically modified organism, another name is GE or genetically engineered. They've relatively new (~20 years?) and no one really knows the full ramifications of them.
If you eat corn (high fructose corn syrup) or soy, both of which are in most EVERYTHING in the Standard American Diet, you are consuming large quantities of GMOs.
Kelly the Kitchen Kop wrote a short and helpful post on GMOs. Cheeseslave's great post says that upwards of 75% of products in our local grocery store have GMOs in the ingredients (which includes baby formula!!) She links to a video that shares:
Below is an interview with Jeffery Smith, an expert on GMOs. Watch it. Educate yourself.
From everything I've read on the subject, the only people for GMOs are the people who are making money from them. Here's a link for more reasons why to avoid them. Down right scary, if you ask me. Don't just take my word for it. Do your homework. You could start by visiting Real Food Media's blog carnival. Join in - spread the word.
It used to be that I bought organic produce because I was concerned for pesticide residue. Now, I'm buying organic to steer clear of GMOs - especially corn products. You won't find high fructose corn syrup in my pantry. Well, except for the 711 Starbursts.
To help you remember which foods are most important to buy organic, here's a handy pocket guide. (Thanks Christy for the idea!)