Denmark has a similar filter (except less effective, it relies on corporation by the DNS providers so all you have to do is use googles DNS) the list itself is secret but it was leaked to wikileaks. On it was several CP sites that were hosted in europe and were shutdown within days, as well as a ton of gay porn and a Duch truck rental company.

The official response? We will consider adding wikileaks to the list of banned sites, for some reason this was never accepted.