XAML (Extensible Application Markup Language) is one of the most exciting innovations to come out of Microsoft in years. It finally enables you to easily bridge the gap between designers and developers. XAML promises to save companies a lot of time, money, and frustration. XAML is used in WPF, Windows Presentation Foundation, and WPF/E, now named Silverlight. WPF applications run native on Windows Vista, and Silverlight applications run anywhere, after installing an insanely small browser plugin.