Ask HN: Any systems out there that keep you update to on what's in your fridge?

My family often forgets about recent leftovers in our fridge, or simply new food that is buried in a drawer in back of the fridge.<p>High level, I'm imagining a system of some sort that automatically "scans" items as they're put into your fridge and as they're removed. The system (accessible via mobile and web) keeps an always up-to-date inventory of what's in your fridge.<p>It reminds you (via physical display, email, SMS, whatever) of soon to expire items and items that haven't been touched in a while. It causes you to stop wasting food and save money on groceries.<p>Anybody know of anything like this out there?