Finding unneeded library references in Visual Studio

I seem to have gotten a bit carried away with the number开发者_开发问答 of libraries I'm referencing in a ASP.Net MVC web application I'm working on. Is there any tools or features already built into Visual Studio 2008/2010 which indicates to me which references I don't need?

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See this older SO question and answer.

Resharper will do this for you, with its clean code context menu.