Microsoft released to the web Visual Studio Extensions for WinFX Beta 1.
By installing it you will get Visual Studio project templates for Avalon and Indigo projects. You will also get intellisense for XAML (at last!) and indigo config files.
Note that this release requires the WinFX Beta 1 version of the runtime and SDK and also Visual Studio 2005 Beta 2 (it will also work with the express editions)