The Australian Commonwealth Government Cybersmart site should be your first port of call for all things related to cybersafety.

It contains all manner of age related sets of information including a great animation designed specifically for Primary Aged students called Cyberquoll.

Cybersmart also has a similar animation aimed at secondary school students called Cybernetrix as well as links to Cybersmart Detectives. Cybersmart detectives "is an innovative online game that teaches children key internet safety messages in a safe environment."