By puting a java applet on your pages that will display photos/info of missing kids. It does't cover your whole page, is like a stantard banner and easy to use. I know it's not suitable for adult sites, but many of you run mainstream sites also and of course you can put it in your webmaster pages. I found it in a casino portal and It's a nice idea.
http://www.missingkids.com/html/index_howhelp.html