The Silverlight team has released a new version  today at the MIX with .NET support. Since Mike announced  this Web developers are waiting for this new feature.
What's New in Silverlight?
The Silverlight 1.0 Beta Enhancements :
- 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, Animations now go in a Canvas.Resources
- Support for downloading and unpacking .zip files
- Support for cross-domain downloads
- Improved text rendering
- Ink support
- Namescope support
- New properties for UI manipulation: Z-Index,
- Downloading fonts for TextBlock
Silverlight 1.1 Alpha will support managed code.
Microsoft started with the Silverlight community Web site at http://silverlight.net . Have a look at the new examples  for 1.0 Beta and 1.1 Alpha. Download the new 1.1 Alpha  or 1.0 Beta .
Have a look at the "How Do I? " videos, too. And the MSDN forums are moved to http://silverlight.net/forums , so update your bookmarks.
One thing I have noticed is that the download for 1.1 Alpha now is about 4.24 MB, the 1.0 Beta version is about 1.4 MB which is nearly the same size as the old version. If you install Silverlight be sure that you have saved your running Web applications because the installer will close all Web browser instances.