In November 2006 Microsoft released a CTP version of the VS 2005 Extensions for .NET Framework 3.0 (WPF & WCF). We released this CTP as a stop gap to provide developers the needed (albeit very limited) set tools to start developing for the .NET Framework 3.0. This was never intended to release as a complete product and was only intended as a stop gap until Visual Studio 2008, codenamed Orcas was released.
Since then Visual Studio 2008 has released and SP1 is on the way. With VS 2008 you have a set of tools designed entirely to take advantages of the functionality introduced with WCF & WPF. Users who have been developing using the CTP extensions should have already migrated their projects to VS 2008 to take advtange of the new functionality which is far better than what we were able to deliver in the CTP.
On Monday, June 30th 2008, the license for this CTP will expire. The download will be removed from the MS Download center. At that point any existing users should work on migrating their projects to VS 2008 to take advantage of the fully supported WPF & WCF support.
The best place to get help and answers to any questions about moving your projects over is on the here on the MSDN Forum: http://forums.msdn.microsoft.com/en-US/forums/.