I use the same combination and it's working well: Eclipse 3.5 + GWT2.0 + Windows7 x64 + GWT DevPlugin.
Why don't you check here? http://ui-programming.blogspot.com/2009/12/update-your-application-to-gwt-20.html where you have the most important steps of upgrading a GWT application to version 2.0. I think it will help you... Cheers!
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