Mr Cameron has organised an agreement with four of the major Internet Service Providers here in the UK, which is basically an opt-out porn filter on new contracts. It's designed to prevent kids from watching porn.
Another 'advance' in the fight against 'smut' is the ParentPort website launced yesterday. It's a website where you can complain about things which you consider unsuitable for children. The 'Video Game' button is particularly interesting:
'[make a complaint about] Any kind of game, whether it was played on a console, a screen or a phone'
I personally think that the porn filter should really be opt out, as it seems there are far more young users of the internet than families. I've not looked at any factual evidence for that assumption though, so please feel free to prove me wrong.