Wander on over to Mike Taulty’s blog to explore this series of posts detailing Mike’s early rough notes on initial experiments with the Silverlight 5 beta.

Multiple Window Support

Markup Extensions

Implicit Data Templates

Ancestor Relative Binding

Silverlight and IE9 in Windowless Mode

Trusted Apps In The Browser

Linked RichTextBoxes

Composition Thread?

Hardware Decoded H.264

Debugging Data-Binding

Trick Play Video

The Third Dimension