As you might inevitably have heard, Avalon and Indigo CTPs are available for MSDN Subscribers. It is located under Tools, SDKs, DDKs | Platform Tools | WinFX SDK | Avalon and Indigo Community Technology Preview – March 05 (English). You take a look at the release notes first. And do not forget about the early documentation. I read somewhere that it is intended to work with the February CTP of Whidbey and if it is true I won’t be able to try it. I am still using the Whidbey’s December CTP because of the new Team System features. I will let you know what my experience is with this CTP of Indigo and Avalon.