Search Engine Learns From User Feedback

An anonymous reader writes "Ian Clarke, founder of the Freenet project, has set up a web search engine that allows users to rate each of the search results it returns. WhittleBit will use your feedback to determine which keywords should be added or removed from your search, then you can search again to get more accurate results. This could be useful for those cases where Google just refuses to return the search results you want. Could improved interactivity be the next big search engine advancement after Pagerank?"