When people obstruct your path at the grocery store because they're on their iPhones you may get, well, impatient. But consider cutting them a lot more slack now that they may be on this new app that scans bar codes to give the lowdown on everything from yogurt to shampoo (if you don't have an iPhone, it offers a texting option). The application comes from the makers of the web site GoodGuide, which gives health and environmental info on 50,000 products and companies. Things the application considers: health performance ( cancer risks, reproductive hazards, skin and eye irritation), environmental performance (emissions, natural resource impacts), and social performance (diversity, compensation, working conditions). Sorry fellow shoppers, if I'm in your way.