A recently leaked European Council proposal seeks to create a "Great Firewall of Europe," instituted to block sites that depict the abuse of children. As with other censorwalls, it's unlikely that this will performed as intended, since paedophiles will circumvent it with proxies, or by using P2P or email or private websites to trade illegal material. But the creation of a continent-wide network censorship scheme is likely to cause new problems, inviting authorities to shoehorn ever-greater slices of the net into the "illegal" category -- this has already happened in Australia and other countries that have built Chinese-style censorship regimes.
One of the most nuanced and important challenges to the EC proposal has come from MOGiS e.V, a German organization of child-abuse survivors. They've issued a statement condemning the proposal on several grounds: first, that censorship is unlikely to attain its stated goals and will create new harms, and second (and most importantly), that the EC should be turning its attention to making it easier for EU member-states and other nations to actually shut down sites that host images depicting the abuse of children.