The present invention is directed to methods of and systems for ranking results returned by a search engine. A method in accordance with the invention comprises determining a formula having variables and parameters, wherein the formula is for computing a relevance score for a document and a search query;...http://www.google.com/patents/US20070106659?utm_source=gb-gplus-sharePatent US20070106659 - Search engine that applies feedback from users to improve search results
