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Well the feature we believe that improves the search experience most is Yahoo! Search Assist. Most of you have already seen the real-time query suggestions we launched on Yahoo.com in July. Yahoo! Search Assist kicks it up a notch, bringing those suggestions to the search results page, along with related concepts that give users a point-and-click query refinement capability that enables them to explore a subject area they may be unfamiliar with.One thing you'll find when you use our new search experience is that Search Assist "automagically" drops down from the search box on the results page when it senses that you're having difficulty formulating a query. But it only shows up when you need it or ask for it. It then offers real-time suggestions and concepts to explore, just like on Yahoo.com. We did this to avoid a common complaint about assistance technologies offered by other search engines -- the "persistent assistance" that puts suggestions on the page regardless of whether a user wants or needs them.
[ysearchblog.com...]