The following sites and devices allow kids to access kid-friendly content and help prevent kids from coming across inappropriate material:
Nettrekker
Safe Search for Kids (powered by Google)
Surfing the Net with Kids
Interactive Internet Safety Resources for Kids:
Parent and Teacher Guide to the Internet (includes fun games to keep kids engaged while learning about using the internet in a safe and secure way.)
Sammy's Guide to Internet Safety (AT&T) - ( an interactive learning resource for educators and parents, this guide teaches kids how to enjoy the internet safely while providing fun activities and games.)