If Bing Is Copying Google’s Search Results, Is It Breaking The Law?
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On the other hand: An interesting and possibly relevant legal issue here is how WestLaw's star pagination system was copied by LexisNexis (http://en.wikipedia.org/wiki/Westlaw#Legal_disputes)
It would seem that Google's ranking would be similar to WestLaws pagination system and might be protected by copyright.
Real world consumer product companies copy what the competition is doing every day (it would be like US Airways putting it's interior designers on a Southwest plane), as long as Microsoft isn't using internal Google spies to steal code or something.
I don't think anyone would be complaining if searching on Bing just redirected to google.com/?q=whatever_you_searched_for