In the medical world their are a lot of privacy concerns. Here is just another to add to the list.

From: Wired News
What Search Sites Know About You
by Joanna Glasner

Brief excerpt:
"..while search engines are quite upfront about sharing their knowledge on topics you enter in the query box, it's not so clear what they know about you. As operators of the most popular search engines roll out more services that require user registration, industry observers and privacy advocates say it's become more feasible to associate a particular query with an individual. "


As a medical librarian, who has to look up different diseases, conditions, surgical procedures, etc. I wonder what "information" they are learning about me.