I remember a day when SDRs were deep, secret mojo that even folks that knew about them were special, let along actually attending them. Now, we’re posting them on the internet. I love my company.
What with the public availability of the Avalon and Indigo CTPs and our stated goal of pre-beta bit releases to gather feedback, you might wonder, "But where should this feedback go?" I'll tell you where to go -- the MSDN Product Feedback Center, which now has entries for Avalon and Indigo. Hog pile on the WinFX API product teams!
Steve Maine of Brain.Save() has done a really good job on the description of a set of duplex contracts in Indigo, i.e. those contracts where callbacks are specified, using the design of a multi-player game of blackjack. Steve shows the service contract interfaces, a bunch of the messaging code and even what's on the wire. Recommended.
Chris Anderson has updated XamlPad for the March 2005 CTP of Avalon and renamed it AvPad. As a tool for learning and experimenting with XAML/Avalon, it can't be beat. Enjoy!