When the PlayStation 3 ships, it will have parental controls built into the unit according to this article on GamesIndustry.biz
I don't see it as too big of a deal as there are already controls on TV
so building it into the console's just another step to being a
responsible parent. Now, parents don't have anyone but themselves to
blame if they don't utilize the function to lock their kids out of
games they don't want them to play.