Interesting article on the BBC website about internet safety for children. It's a difficult issue for parents, teachers and libraries to address and it's one that causes a fair number of complaints from library users.
What is acceptable filtering for one individual is crippling censorship for another, while one person's idea of acceptable material for a child to view is inappropriate to another.
Still - while I by and large think that CEOP is "a good thing", there is no substitute for vigilant and engaged adults helping children thought the internet maze.
More here and here