
POSTED: Feb 16, 2009 10:14 PM (GMT)
The company which I work for (Awareness Technologies) makes software which will do this called Sonar.

POSTED: Feb 18, 2009 3:40 PM (GMT)
There are tons of third-party content filtering tools like the other guys have mentioned. If you only have a handful of clients you can handle this at a basic level in Internet Explorer 7 via Tools/Internet Options/Content/Content Advisor. Here’s an article on it.



















