Scott Guthrie introduced Silverlight 4 during the keynote and showed some of the enhancements that are being introduced to the new version of the platform.
Tim Heuer has done a great job blogging Silverlight 4 Beta – A complete guide to the new features this blog post includes all the tools you need to download to build on Silverlight 4 so I recommend you start there.
In addition to this a number of other resources have been made available as well during PDC:
The Silverlight 4 Training Course includes hands-on-labs, a video and a whitepaper designed to help you learn about the new features in Silverlight 4 focusing on three major areas: Enabling Business Application Development, Empowering Richer Experiences and Moving Beyond the Browser.
Also Channel 9 has published a video Rundown of Silverlight 4 Beta
Key Tweets from @follesoe:
Another key area of interest for me is the enhancements in IIS Media streaming technology. During the keynote Scott (attempted) to preview a sneak peak of publishing smooth streaming video content from IIS to an iphone leveraging the HTML 5 <video/> tag.
If you have an iphone you can try for yourself by visiting http://iis.net/iphone there is more detail about the advancements in the IIS media services in Vishal Sood’s PDC session Building Live Media Viewing Experiences Using Internet Information Services (IIS) Smooth Streaming and the Smooth Streaming Player SDK.
Also Karen Corby did a great job presenting an Overview of Silverlight 4 session at PDC (video).
There are lots of Silverlight related session available for download now. Some highlights include:
Custom Behaviors for Advanced Microsoft Silverlight UI Effects
XAML Futures in Microsoft .NET Framework, Microsoft Silverlight and Tools
Michael Shim, Rob Relyea
Media Foundation: Supporting Hardware Codecs and Cameras
Lots of content to consume and now that Silverlight is installed on around 45% of internet using computers around the world it is a great time to start considering using it for your next project.