Silverlight 4 Beta has just released On November 18, 2009.
Check it out at: http://silverlight.net/getstarted/silverlight-4-beta/
New features which I was look forward to:
- Mouse wheel support for scrollable controls (no additional behaviour is required)
- Right click support
- Clipboard support
- Full editable design surface for VS2010
It could be good fun to move to SL4 soon.