Back in August 2008, I started using a program called OpenDNS for filtering and blocking objectional web content for my home content. I'm still using it! It's done what it advertised and more. It protects your network and your family without having to install a program on each PC. It works for Apple, Windows PCs, and Linux PCs. It is also a good option for your business if you don't want to invest in your own Internet filtering and blocking hardware or software. Go to http://www.opendns.com
to read more about it.