Ok its well established that the authors of the page that started this thread are quite paranoid. But there are reasons to be worried about Google. For one they are too good. And Search engines are highly centralized access points to essential information online. In other words they are the weak link in the decentralized internet.

Information is useless unless you can find it. And if someone (government, corporation, conspiracy, etc) is going to control the internet, then Google is the place the start. Maybe not now, but what happens when they are publicly traded? Or in 10 years when their ideals have melted? We rely extensively on Google and a handful of other search engines to make the internet work, how long will they stay reliable? More Here