A note about Visual Studio 2010 and the Windows Phone Developer Tools CTP
As I noted in my previous blog post, the final versions of Visual Studio 2010 and the .NET Framework 4 have shipped. I wanted to also briefly note that the Windows Phone Developer Tools CTP that was released a month ago at the MIX10 conference is not compatible with the final version of VS 2010. You must continue using the VS 2010 release candidate build in order to use the Windows Phone Developer Tools CTP.
Charlie Kindel posted some information on the Windows Phone Developer Blog with options you can pursue in the meantime, and he also discusses the timing for an upcoming refresh of the Windows Phone Developer Tools that will work with the final release of VS 2010.