If you are environmentally conscious and only want to buy products that are safe and "Green," then look no further than your iPhone. That's because Good Guide [iTunes link] for iPhone allows you to search for these eco-friendly products. As a matter of fact, GoodGuide indexes over 65,000 products in several different categories.
When you search through a category and find a specific product that you would like to learn more about, GoodGuide gives you details that can better help you make your purchase. You can find things like: Overall rating, health rating, environmental rating, and social rating.
You can also create a shopping list with the products that you like; however, this feature requires you to create an account with GoodGuide. The application is available for free from the iTunes App Store.