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.
openacs.org
Explicit
An open-source version of the ArsDigita Community System, comprised of a Web server plus PostgreSQL database. Free download, documentation, FAQ, forums, links to existing sites using this solution. [Unix, source]