OpenDNS to the rescue (again)!
I’ve already been using OpenDNS for quite a while, after realizing that most of my Internet losses of connectivity were, in fact, failures of my ISP’s DNS servers. Recently, however, I was searching for a simple, free, effective porn blocker/web filter for a friend of mine with young children, and I was surprised to learn that OpenDNS had begun offering such a service!
Implementation is relatively simple, assuming you have a static IP: (Dynamic is a bit messier, but still possible) All you have to do is create an account, and associate your IP address with the account. Then go to the dashboard, click “Block Adult Sites”, then choose which types of site to block. Done!
I can think of about 10 different ways to get around such a block, but I suppose a block/filter like this is sort of like locks on doors: to keep honest people honest. It won’t be a substitute for parents actually watching their kids, but another tool for the belt.