Yahoo Mindset is a new service from Yahoo (still in its beta stage). The concept being it allows you to differentiate between having results more weighted towards commercial or research based - this is done by using a slider on the search page (see image above). This idea is very interesting and on the keywords I've tested it seems quite accurate. I also like the way you can adjust the slider after you've searched and the results sort themselves automatically without reloading. Although the slider has very accurate positioning - I did find myself normally wanting one extreme or the other and rarely something inbetween.

The FAQ explains in greater detail and they are interested in user feedback to try and develop the service further.