Hitwise reports that Bing users clicked on a search result 81.54% of the time for queries made in January, compared to 65.58% of the time for Google users, reflecting the finding that Bing, according to Hitwise, was considerably more likely to yield a result relevant to users' queries.
This is certain to add to the discussion of relevancy in search engine results and accusations of copying or user search stream data.
We probably need more in-depth study to really understand how the results and conclusions were achieved.