Duracell has a site that is offering a child safety kit. This is a nice 7 page Adobe document that talks about how you can communicate danger to children. It also states that having an up to date photo of your child is very important you should have a good up to date photo every 6 months.
Digital cameras help a lot with this. I probably have a decently up to date photo every 2-4 weeks of my kids. Of course, Duracell wants you to sign up with them for a reminder email every 6 months. You can do this if you want Duracell sending you emails, however, almost every email client has the ability to set reminders already, if you want to set a reminder, using Outlook or Yahoo, or whatever other email you have, just setup a reminder. You can make it state whatever you want, and won't have to worry about additional sales pushes from Duracell.
If you want to go look at the kids who are missing now, you can go to missingkids.com.