Tim Sneath's blog post here  does a great job of providing details and all the links necessary to get going.

This is a nice milestone.

Good also is the updates to the tooling and the Silverlight v1.1 Alpha refresh (the version with the CLR). Since joining MS about a year ago we've been working on this technology, but getting it released takes a lot of hard work and some time. Finally seeing this get out the door is satisfying to me, even though I haven't had to do any of the heavy lifting. :)