The GoodGuide's original iPhone app was a super-helpful tool for conscientious shoppers—and its new iPhone app is even more helpful. Now, instead of looking a product up, all you have to do is scan the barcode with your phone's camera. Once you scan the barcode, the app will give you all the green info you need on that particular product. With information on more than 50,000 products and companies, it's sure to be an invaluable tool during the holiday shopping season. And it's free. We're testing it out today. Learn more about the GoodGuide iPhone app here.