Not to rain on a self-righteous parade, but...
@index argumenters: Google - and other search engines - indexes websites in general, including whatever links are on those websites. Thepiratebay (and mininova, etc. etc.) do not "index" torrent files by going out and finding them, they specifically ask users to submit them, and then in the case of really audacious sites, offer those files through their own tracker system.
I love downloading stuff through torrents, but I also love using my brain - if you run a website dedicated to categorised user-submitted ilelgal content and offer a tracker service to enable people to find your way into the cloud of seeders for a particular file, then yes, you're very obviously quite specifically oriented towards bringing people illegal material. You're not an "index" for external content, you're a user-based content provider, geared specifically towards offering world+dog illegal material. It''s really not a complicated argument to make.
Personally, I hope torrent trackers stay available, because they offer neatly categorised content that would otherwise cost me an arm and a leg, but you're deluding yourself if you validate using them by pretending they're just "google for torrents".
And @Lee JAckson, no: downloading copyrighted material is not stealing. It's an activity that can, but not always does - that said, in the vast majority of cases does - lead to immaterial damages. Copyright infringement of this nature is tantamount to exactly what it says on the tin: copyright infringment.
Don't go and equate it to a crime that's defined by taking posession of something by taking it away from the original holder. You woldn't steal a car, because you´re removing someone´s posession. If you had a machine that could instead scan that car and make a perfect duplicate, without paying the manufacturers that contributed to putting that car on the road, then hell yes, everyone would be cloning those ferrari 335s and pagani zonda's.
You wouldn't steal [fill in real thing here], but you sure as hell would copy it for free if you could, because that's what we like, and that´s what we see in these cases. Any amount of money for a product compared to free will only lead to people paying money if they think the product´s worth it, or the creators deserve it. Welcome to psychology 101.