This blows my mind. The Music Industry (Universal, Sony, Warner, EMI) has successfully sued a man in Australia and his ISP for linking copyrighted material. It wouldn't be surprising if it weren't for the fact that the he wasn't hosting the files - they weren't even hosted at that ISP. All he did was point people to the files.
A Slashdot commenter put it well: In other news, a man in Queensland was found guilty of pointing at a stolen car in the street...
Holy slippery slope! What next? If I can be sued for linking files, then why not for linking to a page containing them? How about linking to a site where infriging material exists? How about mentioning the name of that site? Google may be in trouble.
You may also want to look at Kornbluth's short "The Marching Morons" (Galaxy, April, 1951).
Once the lawyers take over, it's all . . . over.