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.
GNUnet - GNU\342\200\231s framework for secure P2P networking
Free (GPL) peer-to-peer framework of the GNU project with a focus on anonymous file-sharing. Works under Linux, BSD, OS X and Windows.