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.
Can Social Bookmarking Improve Web Search?
By Paul Heymann, Georgia Koutrika, and Hector Garcia-Molina Dept. of Computer Science, Stanford University Stanford, CA, USA. The paper includes eleven experiments designed to evaluate different aspects of social bookmarking and their impact on web search, using del.icio.us bookmarking data, Yahoo! and AOL search data, and ODP data gathered between May and June of 2007.