Silverlight 4 beta ! This was the big day 2 news!.
Tim Heur has a good overview of the new features here:
If you want to get stuck in you can download the bits here:
And there are some great training videos already published on Channel 9:
and on Silverlight.Net:
Silverlight 3 to Silverlight 4 Conversion.
After installing the bits via the link above I proceeded to open my own Silverlight application (http://FromTheMalverns.com)
Woah! – No obvious issues – very cool & it ran first time under the Silverlight 4 beta.! OK so next step is to add some of the new features which I will do in the coming days (Maybe after I get some post PDC09 sleep!).
NB In the meantime I will be continuing to develop http://FromTheMalverns in Silverlight3 until such time that there is a real Silverlight4 release!