trojans, virus, worms.. on those torrent sites?
Over time, you'll come to recognize the names (and groups) of the uploaders. IN the meantime, sites like thepiratebay.org and demonoid.com have a ratings system (VIP, trusted, etc). The comments section also is really quick to expose any problems. And, of course, no matter what you download, you have a 0.0001% chance of infecting your machine if you exercise a modicum of caution and use an updated virus protection software.
It is rather odd, but these guys are fighting for "supremacy" on these sites and take their group's name very seriously.