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.
lambda.uta.edu
LDB is a free object-oriented database management system built on top of SHORE 2.0. It supports ODMG ODL specifications and can handle most ODMG OQL queries using a query optimizer. [Open Source but copyrighted]