I just came up with an awesome idea! It's based off of a Samsung Galaxy commercial I recently saw. It's an app that helps trick-or-treaters figure out which front doors to knock on and which front doors to avoid. The app should be as simple as this: The first page of the app would have a map of houses, and perhaps allow the user to look at a Wikitude-like street-view image. The page should also have a button that says "Rate this house." Upon clicking this button, the user should then be taken to a page where he or she can correct the location feature's estimate of the house's address and tell others why he or she thinks the house deserves that rating. The app could also use a local notification to alert other users if they're in the vicinity of a 5-star house or a 1-star house.