Web Wise Kids - http://www.webwisekids.org/index.asp - is a great resource for parents and schools. It has a variety of resources, many free, to help educate students on the dangers of online predators, sexting, and more. Some resources only have a "suggested donation." The costs are minimal and the resources are very good. You can also sign up to get updates of new and emerging technologies and how they can present issues for kids.
