The WinFX Beta 1 RC SDK is now available (there is a link to the ISO further down the page). There are lots of samples for both Avalon and Indigo but you need to extract them manually. After I installed the SDK I found a number of directories with samples which were not working. However, the samples in the Allsamples.zip file, which is located in the same directory, work just fine! There are some new interesting ones for Indigo in there. Enjoy!