If you have an SMS-enabled mobile phone and an AOL account (you have one if you use AOL Instant Messenger) you can setup an alert via email/IM/SMS whenever there is an AMBER Alert broadcast by law enforcement in your area (zip-code).

This is really neat, costs nothing or nearly so (your phone probably will charge you for the SMS, mine cost $0.10), and could save a child’s life. From mobilewhack.