Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
www.fourmilab.ch
Explicit
The objective is to develop tools, perform experiments, and collect data, making all of these freely available to researchers. Contains online tests, results and analysis as well as research papers.