This can't be real. Or is it?
They are allowed to 'scan' files from your computer?
Comcast does that too and sent my friend one of those notices when he tried to get GoW. They didn't disable his connection, at least. Of course, he feels that he deserves to download GoW for free since Epic stole his $50 for UT3, GoW's a cheap console port, and there's no demo to try.
They don't scan your computer (I hope); they monitor their traffic. Many torrents are planted and watched by third parties there for anti-piracy concerns. Applications like PeerGuardian are useless in this way since they are checking the traffic before it even gets to you.
I'm pretty sure that's the reason a Comcast connection gets really slow and unresponsive when you have a torrent going -- including legal ones. When their system recognizes that protocol, they likely dump all your traffic into a monitoring system to check for blacklisted files, slowing things down in the process.
I think isohunt is rife with fake/planted/watched files. Don't use it.
Edit. On topic, I just finished getting pissed off at COD4 on veteran difficulty so I'm going to go watch Shawshank Redemption and eat some Wheat Thins.