Scour say their purpose is to
"bridge the gap between searchers and relevant results". Results from the 3 largest search engines, Google, Yahoo and MSN Live are agregated, in a rather slick interface, showing a summary of the page alongside which engines have indexed the result and how they have ranked the page. It also provides a platform for the user to vote and comment on relevancy, searchers connect with one another creating a social search community.
Unlike some of the other search engines that combine alogrithyms with user rating, the interface is extremely simple there is a thumbs up or a thumbs down for each result and an option to add a comment.