Just a quick one for the frustrated searchers out there. If you've recently installed the SP1 beta for Visual Studio 2008 (or just the 3.5 sp1 beta alone), and you find that you have serious difficulty using SharePoint Designer 2007 against a remote instance of SharePoint running in a VM (or a physical machine) that doesn't have the SP1 Beta bits, you know what to do. My SPD would refuse to load the master page from my virtualized SharePoint instance until I had installed .NET 3.5 SP1 Beta onto the virtual machine also. Just so you know!