At MIX08 Microsoft announced the releases of Silverlight 2 Beta 1 and the tools suite for VS2008.
The download for the plug in is around 4 MB for SL 2, and over 54MB for the tools.
Source code for the controls and Unit tests were also released and can be found here
Also it was announced the release of Expression Blend 2.5 March Preview, which you will need if you want to play around with the labs in the learn section.
Heard in dot.rocks about the Telerik RadControls for Silverlight controls, you can have a look at their work in progress here
I haven't played with Silverlight at all just yet but I been following what's coming out of Redmond through ScottGu and his blog. He published a number of tutorials that I'm eager to have a closer look now that I installed the tools.
I wonder what impact this is going to have on the web?
Lots of controls out of the box..
I also had to create a simple HelloWorld type page. And I have to admit it looks cool.