To learn more about Silverlight 2 and download the Beta2 release, please visit the http://www.silverlight.net and http://expression.microsoft.com web-sites.  We'll be posting articles, tutorials, videos and more on both sites in the days and weeks ahead.  I'll also be posting some tutorials of my own here on my blog as well. 

If you haven't already read them I'd also recommend checking out my previous First Look at Silverlight 2 and First Look at Expression Blend with Silverlight 2 blog posts that I wrote a few months ago when Beta1 shipped, since they provide a good overview of the Silverlight programming model and how to target it using both Visual Studio 2008 and Expression Blend.

Hope this helps,

Scott