Google VP Describes "The Perfect Search Engine"
This is a really interesting article about how often Google changes it's algorithm and modifies it's search results. You might be on page one this morning and be long gone by the afternoon. It really shows the value of a strong link campaign and solid content on your site.
http://www.computerworld.com/s/article/9140630/Google_VP_Mayer_describes_the_perfect_search_engine