As Scott Dockendorf mentions, we launched the beta version of a new online music community site today called Crossfader in partnership with »telligentsystems, the guys responsible for CommunityServer. From the site: "Crossfader is an online community for the global electronic artist. We are building this tool to help you connect with people who share your love for creation, great music, technology and modern culture." So, if you're into hip-hop, techno, or trance, this sounds like a site that should be added to your short list.
On a somewhat related note, I'd be remiss if I didn't mention Rockstar Games (of Grand Theft Auto fame) recent Beaterator, a real-time music sequencer that runs in your web browser. This thing is addictive. I know the guy who was intimately involved in putting the site together, and I'd say he's done a great job.
We've released the Avalon and Indigo CTP for March, 2005 (otherwise known as the WinFX™ SDK) for MSDN Subscribers. The download includes documentation, samples, command-line compilers, and various tools to help you develop applications using Avalon. The download is a 444.67MB ISO CD image that can be found under Tools, SDKs, and DDKs | Platform Tools, SDKs, DDKs | WinFX SDK - Community Technology Preview. We've also posted the release notes and updated WinFX SDK documentation.
According to Brad Abrams, these bits work just fine with the latest Visual Studio 2005 CTP. I haven't spent as much time with Indigo, but Avalon is very exciting! If you have the time, please download this release and provide us with your feedback.
Update: Our own Karsten Januszewski has provided a very helpful article about what's new for Avalon in the March 2005 CTP.