You are now able to get Silverlight 3 from: http://silverlight.net/getstarted/silverlight3/default.aspx
See all the new features here: http://silverlight.net/getstarted/silverlight3/default.aspx#whatsnew
I just saw the key note from MIX09 live and ScottGu showed some of these new features, it looks awsome. Can't wait to get started!
- Enjoy!