I’ve been using the BlueCoat K9 Web Protection product for some time now. It’s purpose is to help keep you or your kids from going to inappropriate web sites. The degree of inapropiateness you disallow is dictated by how you configure the filter and what site categories you allow.
Note that if you have kids, this is a perfect companion for your home computer. The product is free; all you have to do is register to get your free license key. Download the product here: