Check out this article I found:
Google Shows Reading Levels for Search Results
Google Operating System
Google's advanced search page has a new feature that lets you restrict results to a certain reading level. You can choose from showing basic results, intermediate results, advanced results or annotating the results with reading levels."Sometimes you may want to limit your search results to a specifi…
http://googlesystem.blogspot.com/2010/12/google-shows-reading-levels-for-search.html 
