WPF/E的正式版本Silverlight已经公布了，下表列出正式版所有的特性与.NET 3.0中WPF以及Flash/Flex的特性对比:

Features/Benefits	Silverlight	.NET 3.0	Flash/Flex
Rich 2D animation/graphics with audio and video	ü	ü	ü
Industry standard video codec	ü	ü
Scalable video format from HD to mobile	ü	ü
Hardware-assisted editing and encoding solutions	ü	ü
XML (XAML)-based presentation layer for SEO	ü
Choice of standards-based and high-performance languages	ü	ü
End-to-end server and application platform	ü	ü
Media server licensing (unlimited bandwidth)	$999	$999	$4500
Content access protection (DRM)	ü	ü
Client side playlists for ad-insertion	ü	ü	ü
Robust video publishing tools and 3rd party ecosystem	ü	ü
High-performance, multi-core enabled client	ü	ü
Scalable full screen video up to HD (720p)	ü	ü
Native support for device-based video	ü	ü
Offline, document support		ü
Client size	~2MB	~50MB	~2MB
Supported operating systems	Windows/ Mac	Windows	Windows/ Mac/Linux