This is awesome and exciting!

Some of the places to look might be hard to find until later today, the sites are all being updated.

Christian Schormann (Blend PM) has kindly provided a set of working links to everything available now.

Silverlight3 RTW, Blend3, SketchFlow, DeepZoom Available for Download

He also has terrific posts and demos about the Concepts and Overviews

Watch Visual Kitchen here: http://vepexp.microsoft.com/seethelight

And go visit See the Light for a nice vision of what the new versions of Silverlight and Blend can do to help your development shine.