When a team of Pennsylvania State University researchers set out to discover the cognitive processes underlying search behavior, the team discovered that Google, Yahoo, Microsoft and other search engines have become part of the learning process for people who venture online.
Check it out: http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=118064
http://www.morganclaypool.com/doi/abs/10.2200/S00191ED1V01Y200904ICR006?journalCode=icr
http://ist.psu.edu/faculty_pages/jjansen/webanalytics/understanding_web_analytics.html
http://jimjansen.blogspot.com/2009/08/latest-search-engine-research-that.html