Somewhat off-topic but still relevant for those of us with kids. Here is a brief description of one such browser that impressed me (http://www.kidzui.com/):
"KidZui is a revolutionary new kids' browser that makes surfing the Internet fun and easy for kids from ages 3-12. It has over 600,000 kid-friendly websites, photos, and videos. Content is reviewed by teachers and parents so your kids can surf independently. It is a great way to stay in tune with your kids by providing you with weekly e-mails and online reports keeping you up-to-date on your kids'"
A full list can be viewed here: