Censorship on the web

These days, it's becoming a common occurrence to hear about how the Chinese government has blocked Corporation X's website from their country. That's something you come to expect from them. In the United States, it's not quite nearly that bad....but it's slowly going in that direction. That's not to say that we'll ever see the same kind of widespread blocks of certain sites. However, certain companies are doing their best to wipe a couple of sites off the face of the Internet. One in particular is Pirate Bay, a popular website for downloading software, TV shows, Music, Movies, and all sorts of other stuff. Most, if not all, of what they do infringes a myriad of copyright laws (as evidenced by their proudly posting a list of companies that have threatened to take legal action against them). Most of us will agree that using this site is stealing. Hopefully all of us will agree that stealing is bad. Google thinks Pirate Bay is so bad that it's wiped them from their Autocomplete searches. Even though this is not the kind of full-scale censorship we see in other cases, it wreaks of user restriction. Google may do whatever they wish. After all, they're a business. But how far can a company go (or a government, for that matter) before crossing the line? Where is the line between protecting people from others (a sometimes difficult but worthy cause) and protecting them from the freedom of expression (a sometimes difficult and very controversial cause)?