kids.us domain for children

The internet has a new sandbox. One that will supposedly be safe for children - kids.us. The US House of Representatives approved a bill on Tuesday that allows a domain to be set up specifically for children. There will be some limits imposed upon pages within kids.us:

Web sites in the domain would be prohibited from linking to sites outside it, and they could not set up chat rooms, instant messaging or other interactive services unless they could certify that they did not expose children to pedophiles or pose other risks.

Also not to be included: violence, hate speech, sexually explicit material, and other topics deemed not suitable for children. As much as I like this idea, why do I think that it will bring out some strong opinions regarding what type of material is or isn't "suitable for children?"