Following a release to MSDN subscribers last week, Microsoft has made its March Community Technology Previews of Avalon and Indigo available for public download.
Avalon and Indigo are two “fundamentals” of Longhorn, the next release of Windows. Avalon is the presentation subsystem and Indigo is a platform for Web services.
According to Microsoft, Avalon unifies how Windows creates, displays and manipulates documents, media, and user interfaces. Indigo extends the .NET Framework 2.0 with additional APIs for building secure, reliable, transacted Web services.