Visual Studio SDK 2005-10 RTM is now available for download at http://affiliate.vsipmembers.com/affiliate/downloadFiles.aspx.  This the correct version of the VS SDK to utilize with Visual Studio 2005 RTM.

I have also posted a forum topic Official VSL feedback and suggestions thread on the Visual Studio Extensibility forum.  I would encourage any C++ developer's targeting the Visual Studio Platform to make use of this thread.