Vista will block sites based upon rating or content - but cannot
automatically block some sites that aren't categorized. In this case it's a
simple matter to add the site to the "Blocked Sites" list in Parental
Controls.
Having 2 teenagers myself, I constantly screen my router traffic for
questionable sites that the kids may be visiting - then I either block them
in Vista or in the router. Vigilance is the watchword here - luckily Vista's
Parental Controls have a reminder to check the accounts periodically.
- John