I've been happy with the Parental Controls and Content Advisor in Windows for my boys' computer too. I like that it blocks
content, not just words, pics, etc. since some websites seem very inocuous (try searching Disney characters' names

Yikes!). My sons are 12 and I (stupidly!

) thought I wouldn't have to worry about this kind of thing for another couple of years... and found out the hard way that I needed filters NOW!