Parents need to know that the content is framed by 10 ads per page, including a banner at the top and a "tip jar" (for donations to the site itself). The KidsTurnCentral forum is fine, but the way the DelphiForum product is set up it's too easy for kids to get to other places meant for adults.
I love Kidsturn, I think it is the best forums and chat I have ever some across, and Wendy is a great host. I don't think the commercialism is an issue, especially as we all want Kidsturn to continue to be free and available for us to all use :)