Check all files with Bitzi before downloading.
Avoid files that have "PTHC" (pre-teen hard core), or "hussy fan" in their name. I suggest you block those.
Delete anything that looks illegal.

The FBI took my friend's computer and found tons of files that he had deleted (and thought he had overwritten) on his hard drive. They found that he had (accidently) downloaded a few PTHC files, but he had immediately deleted them. (My friend is gay - he likes men, not children). He was not charged. They suggested he be more careful - see below. [His case had nothing to do with file sharing.]

The FBI says:
Say you get an illegal item in your mailbox. You trash it right away; no problem.
Get more illegal stuff and trash it immediately; you may have some explaining to do. Keep illegal stuff, even if you don't share it; go to jail.

Downloading child porn, even if you're just curious to see if it's real, encourages the criminals who make that krap; they like to be watched. Let's frustrate them.
There are international agencies that are working to catch these people.

So far it looks like they're getting better at it too. Let's hope this
means they'll be driven out of gnutella over the next few years as
they realize they have no real anonymity here.