The Sage Project is a new web-based app that brings an interactive food label to life online - try it out! I worked as a consultant for Sage during its early development phase and it's exciting to see it launched. There are A LOT of bells and whistles (including a chocolate bar that jumps rope), and I think different aspects of the Sage Project will appeal to different people. My favorite feature is the personalization that if offers. You can sort through over 20,000 food products many ways, with filters on top of filters. The website might be most useful to those with a food allergy or someone looking for guidance when switching to a new diet. For example, if you have a peanut allergy and are looking for granola bars, a search will bring up all products without peanuts. (When you are actually shopping at the grocery store, I would double check the nutrition facts label - ingredients in products change all of the time.) Or if you are vegan, a search for "chicken" brings up products like chickenless nuggets and Amy's No Chicken Noodle Soup.
For an additional take, read the summary in this New York Times article - An App to Deconstruct Your Food