Gil's link of the day!
http://likebetter.com/ Click on which picture you like. Eventually, the computer will be able to tell a bit about you from what you like.
http://www.techcrunch.com/2006/08/06/aol-proudly-releases-massive-amounts-of-user-search-data/ AOL released a bunch of searches that users have made, and categorized them by a random user ID.
http://www.gregsadetsky.com/aol-data/ Mirrors of the AOL data released.