How are you tagging food items? Is it embedded into your fridge/pantry? Are you thinking about using your cell phone to "scan" every item? If the auto food tagging infrastructure is in place, a web/mobile app can have interesting applications.

It might be easier if "intelligence" is integrated into refrigerators like - http://www.engadget.com/2007/04/23/siemens-refrigerator-gets...