In "Warrants Required: EFF and Google's Big Disagreement about Google Book Search," Cindy Cohn discusses the Electronic Frontier Foundation's concerns over privacy issues in Google Book Search.
Here's an excerpt:
One of the most important of those protections is the assurance that your browsing and reading habits are safe from fishing expeditions by the government or lawyers in civil cases. In order to maintain freedom of inquiry and thought, the books we search for, browse, and read should simply be unavailable for use against us in a court of law except in the rarest of circumstances. We have other concerns about Google Book Search as well—concerns and data collection, retention, and reader anonymity—so this won't end the debate, but safeguards against disclosure are a central point of concern for us. . . .
Given this backdrop, we asked Google to promise that it would fight for those same standards to be applied to its Google Book Search product. . . .
Unfortunately, Google has refused. It is insisting on keeping broad discretion to decide when and where it will actually stand up for user privacy, and saying that we should just trust the company to do so. So, if Bob looks like a good guy, maybe they'll stand up for him. But if standing up for Alice could make Google look bad, complicate things for the company, or seem ill-advised for some other reason, then Google insists on having the leeway to simply hand over her reading list after a subpoena or some lesser legal process. As Google Book Search grows, the pressure on Google to compromise readers' privacy will likely grow too, whether from government entities that have to approve mergers or investigate antitrust complaints, or subpoenas from companies where Google has a business relationship, or for some other reason that emerges over time.