Yahoo! Research is currently working on a search tool named Yahoo! Mindset which sorts out the search results based on the “intent” rather than just the query revelance. It is utilizes machine learning technology and text classification techniques to clasify results as meant for Shopping or Research. A slider enables us to determine the weightage given to either of the classes (shopping and research) which in turn sorts the results accordingly. More information can be found at Yahoo! Mindset FAQ.