5. The method of claim 1 , further comprising identifying the search expertise level based on a post-query browsing behavior, which is browsing behavior of the searcher after a query has been submitted to the search engine and a search results list has been returned to the searcher.
5. The method of claim 1 , further comprising identifying the search expertise level based on a post-query browsing behavior, which is browsing behavior of the searcher after a query has been submitted to the search engine and a search results list has been returned to the searcher. 6. The method of claim 5 , further comprising: statistically correlating at least one of a plurality of post-query browsing behavior features with the search expertise level of the searcher; and identifying a number of times the searcher revisits pages in a search trail as a post-query browsing behavior feature.