Search Analytics
The book, Understanding User - Web Interactions Via Web Analytics, provides a rather lengthy discussion of search analytics.
Here is one type of tool that provides the type of search terms that bring a person to a Website and the type of Websites that appear on a search term, Compete Search Analytics.
Web Analytics - Search Insights You Can Act On Today – You have to work though the sales pitch (which isn’t too bad), but this Web Analytics - Search Insights You Can Act On Today provides some workable information in using Web Analytics for search.