Not actual documentation but interesting article on XAML
This just came in: http://www.zdnet.com/blog/microsoft/microsoft-splits-up-its-xaml-team-whats-the-fallout/9807
It gives some insight on the future of XAML, what it is, etc. For a more technical overview, MSDN library is always useful: http://msdn.microsoft.com/en-us/library/cc189054%28v=VS.95%29.aspx
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