• Silverlight 2 compatible engine.
  • Deep Zoom
  • Control framework
  • Layout framework.
• Microsoft Media Pack 2.0 for playing video and audio.
• Includes Mono for executing code (C# and DLR-based languages).
• Runs the Silverlight 2.0 MS-PL controls and 2.0 based applications.

• Silverlight 3 compatible engine.
  • 3D graphics
  • Pixel shaders
  • Application library caching
  • Out-of-browser capabilities and offline support
  • Pluggable media pipeline to support 3rd party codecs
• HD Smooth Streaming
• Native support for MPEG-4-based H.264/AAC Audio

Most feature implemented, but will ship in Moonlight 4

• Silverlight 4 compatible engine.
  • Webcam and microphone support
  • Trusted applications can read/write to users' documents directories
  • Improved localization, including right-to-left and bi-directional text
  • Desktop notifications ("toast")
  • Render HTML on Moonlight surfaces
  • WCF RIA Services

This will be the first Moonlight release that uses Microsoft's Media Pack 1.0 for playing back video and audio.

• Silverlight 1.0 compatible engine.
• Scriptable with the browser JavaScript.
• C/C++ based, no managed code.
• Distribution: Linux/x86 and Linux/x86-64.
• Source code releases for any other operating systems