AFAIK, the parental control currently implemented works very well.
The best thing to use to help work with CIS, is a HOSTS file. A HOSTS file will block known ad, tracking, and malicious sites.
A good FAQ about HOSTS files can be found here:
http://www.mvps.org/winhelp2002/hostsfaq.htmand here
http://www.mvps.org/winhelp2002/hosts.htmAlso, using SpywareBlaster is a good technique to help block the installation of spyware. (
http://www.javacoolsoftware.com/)