Shhhh: The Phone App
APP IDEA: You search street address data for churches, movie theaters, libraries, etc. and create a database of restricted areas. The app automatically puts your phone in silent mode when you enter a restricted zone, then reverts back to your settings when you leave.
A great, easy to use feature for a free app. If they want to upgrade to a $.99 app, they can get the ability to add custom areas and determine the phone settings for each.