btw--this is the Bearshare Forum
Anyway, the first thing you can do is to make sure you ignore files with names designed to thrill KiddyPorn seekers.
Just ask why anyone would want to name files with names designed to shock? I suspect anyone really trading in KP would not be using an open network like gnutella.
If there really is any serious KP traders, they're pretty foolish to be sharing on an open network like gnutella, and the LimeWire folks, at least, are working with the FBI to put the criminals away.
See
http://p2pnet.net/story/3934 for more details
In the meantime, don't encourage those who try to attract attention by using KP words in filenames--don't click them: IGNORE them.