Seems like something’s amiss in the internet. Danny Sullivan, Editor-in-Chief for searchengineland.com ran a story about Bing allegedly copying Google’s search results. He has a whole wall of text explaining how Bing does it but it seems that users who run Google searches on IE send (unwittingly) information to Bing, and Bing in essence copies those results. The whole shebang is explained in Danny’s story, and Google’s official explanation on the links below.
Source: Search Engine Land, Official Google Blog