I can honestly say that I have never seen anything like that. Maybe because I don't usually download children's movies + I am a long time user of Limewire, so I know how to search pretty well.

I also use the Keyword Filter to filter words that imply anything KP related, so most of the results you are talking about never show up in any of my searches. Mislabeled files are off course not that easy to block, but I have been lucky so far. Also use Bitzi to see if the files have been rated good or bad before downloading.

I think people should report those perverts but still like I said make sure first that it in fact is someone "evil" and not some innocent person that has downloaded something of that nature by mistake.

Things like writing down the date and time of the download are very important, since dynamic IP's do change often. Also maybe taking a screen shot when you browse the host and other things like that. These things will not only prevent innocent people from getting in trouble, but will most likely help the authorities build a case against the offender