3 XAML vocabularies: UI, Workflow, XPS. Used in mutliple runtimes: .NET 3,0, 3.5, Silverlight 1 and 2. Many tools too (Visual Studio, Expression Blend). XAML Specds were published earlier this week, 600 page volume schema for all variations of the language. Lots of file converters exist, from SVG, Flash, Illustrator, WMF, etc etc etc. The list is impressive! Next version will be extended to support more XAML-only code. For example, support for generics. Investments will be done to catch XAML errors ...