not sure if this one already post.. but i read this google post about bing uses Google search, this is very interesting. And shame for bing if this one is true: http://googleblog.blogspot.com/2011/02/microsofts-bing-uses-google-search.html
Reading other reports of this, I don't think they denied it at all (if not coming totally clean). But it was a really good sneaky find by Google with the tarsorrhaphy search.
i read blog and try to match results for 10 queris only few results are matched so according to me bing not coppied results from google.