I just received an email alert informing me of an address change of a registered sex offender near my home.  I had previously registered to receive these updates and like getting this visual reminder of potentially dangerous areas to avoid.

Family Watchdog is a free service to help locate registered sex offenders in your area. They encourage you to use their site to help educate your family on possible dangers in areas they visit. You can also sign up for free notifications to keep updated with offenders that move in/out of your area.