The Silverlight team has released a new version today at the MIX with .NET support.
Here is a list fo whats new in 1.0 Beta:
* Improved install experience
* VideoBrush (used to paint shapes and text with video content)
* WMS streaming support
* Media markers/script command support
* Playlist support (ASX subset)
* Improved video playback smoothness
* Cleaned-up animation model
o Animations now go in a Canvas.Resources block
* Support for downloading and unpacking .zip files
* Support for cross-domain downloads
* Improved text rendering
* Ink support
o Enum support
o Better error handling
o Support for delegates as event handlers
* Namescope support
* New properties for UI manipulation:
* Downloading fonts for TextBlock
Over here is a complete list of new features as well as whats changed to Alpha 1.1
Apart from that there is a good review of the major “Breaking Changes”(such as control installation etc) that you might come across.
Check them out!