Silverlight 5 got released this weekend and can be downloaded here: http://www.silverlight.net/downloads.
Summary of the features
(from the Silverlight 5 download package)
Improved media support
- Low Latency Audio Playback
- Variable Speed Playback
- H/W Decode of H.264 media
- DRM Key Rotation/LiveTV Playback
- Application-Restricted Media
Improved Text support
- Text Tracking & Leading
- Linked Text Containers
- OpenType and Pixel Snapped Text
- Postscript vector printing
- Performance improvements for Block Layout Engine.
Building next-generation business applications
- PivotViewer
- ClickCount
- Listbox/ComboBox type-ahead text searching
- Ancestor RelativeSource Binding
- Implicit DataTemplates
- DataContextChanged event
- Added PropertyChanged to the UpdateSourceTrigger enum
- Save File and Open File Dialog
- Databinding Debugging
- Custom Markup Extensions
- Binding on Style Setters
Silverlight 5 performance improvements
- Parser Performance Improvements
- Network Latency Improvements
- H/W accelerated rendering in IE9 windowless mode
- Multicore JIT
- 64-bit browser support
Graphics improvements
- Improved Graphics stack
- 3D
"Trusted Application" model
- Multiple window support
- Full-Trust in-browser
- In-browser HTML support
- Unrestricted File System Access
- P/Invoke support
Tools improvements
- Visual Studio Team Test support