Today Scott Guthrie announced the availability of the Silverlight 4 beta as of today! Incredible advances made in what is best measured in months. Webcam and mic support in raw format, printing, chrome-less window support (though not available in the beta build) truly amazing growth in the plugin and plugin adoption, really great to hear the adoption story improving as well.
Some points about SL4
With Silverlight 4 beta, released on November 18, Microsoft continues to empower developers to create rich, compelling user experiences both on and off the Web.
New out-of-browser capabilities extend beyond the browser, enabling new experiences that reach deeper into the desktop without additional code or runtimes required.
Webcam and microphone with local recording capability opens new possibilities for innovative interactive media experiences.
Native multicast support enables efficient enterprise-wide training and internal communications behind the firewall.
Silverlight 4 is delivering a full suite of powerful capabilities to enterprise application developers.
Full support for Silverlight in Visual Studio 2010 gives enterprise developers a tried and trusted development environment and languages that scales for mission-critical enterprise scenarios.
Integration with Microsoft Office and Microsoft SharePoint bring the benefits of Silverlight interactivity to a broad enterprise install base.
Enhanced printing, networking, databinding, reporting and charting capabilities satisfy common business needs.
Silverlight has a growing library of more than 60 customizable controls with everything you need to create rich, interactive applications to rapidly build attractive, functional business applications.
Starting November 18, developers can begin testing the capabilities of Silverlight 4 beta and plan for the great applications they can create tomorrow.
The developer community is our lifeblood, and we continue to support developers needs with Silverlight 4.
9 out of the top 10 most commonly requested features were incorporated into Silverlight 4.
The Silverlight platform continues to experience meteoric growth since hitting the market in 2007.

Get the ball rolling!