OpenDNS

Everyone knows the internet is full of all kinds of content you may or may not want to see. You may have young kids at home or run a small business and don't want others to view content that you consider "inappropriate". Well OpenDNS is the answer! You can manually change your DNS on your computer to use OpenDNS servers instead of your normal DNS servers. With your OpenDNS account you can specify from the low, medium, or high filter level. You can even select custom and choose from 55 unique categories to block.

http://www.opendns.com/