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danimal - 7:16 pm on Mar 21, 2006 (gmt 0)
so if your site is in the top 3, it'll drive more traffic, but the question is, how does that increase up the ctr on your site? could it be a function of relevance to the term being searched? is it specific to your niche? etc.
there are eyetracking studies that show how favorable the top search results are, in terms of how much time the user spends looking at the page... anything beneath the top 3 takes a big hit, the further down the page you rank, the worse it is.