Learn with Professor Garfield Teach Internet safety with Garfield. You can watch a cartoon about the topic and then try it as a quiz. It could be done as a whole class or individually.
PBS Kids - Webonauts Students complete a series of games to become a "webonaut." Along the way they learn many ways to be safe on the Internet.
NetSmartzKids Fun games and videos to learn about Internet safety.
Safety Land Choose a building to explore and then answer the question for the building. It can be done whole class or individually. Even my sixth graders had fun with this website.