Silverlight 5 Beta is available for download
These are the top beta features
- XAML Debugging with breakpoints for binding debugging
- Implicit data templates for easy UI reuse
- Double (and multi) click support
- GPU-accelerated XNA-compatible 3D and immediate-mode 2D API
- Low-latency sound effects and WAV support
- Real operating system windows and multi-display support
- Significant performance improvements, fixes and much more
More info about new features here: http://www.microsoft.com/silverlight/future/
There are also these items for download
- Silverlight 5 Beta Tools for Visual Studio SP1 (required)
- Expression Blend Preview for Silverlight 5 (optional)
- Silverlight 5 Features Document (optional)
Download Silverlight 5 Beta and the optional downloads here: http://www.silverlight.net/getstarted/silverlight-5-beta/