Keeping kids from viewing porn online has never been tougher. Even when you're trying to avoid it, sexually explicit material pops up everywhere, from mistyped URLs for popular sites to links embedded in instant messages. The Supreme Court decision last week to block enforcement of a rule that would have placed the burden of censorship on Web operators serves as a good reminder to parents to evaluate their family policy on what type of material is O.K. for their kids to view. While parental supervision is always a good idea, software filters can help too.
The leading online services offer relatively...