Yesterday came the announcement that Silverlight 2 is finished and ready to go although there was no accompanying download available yet. That download is supposed to appear on the Silverlight site sometime today and may already be available depending on when you're reading this.
Silverlight 2 considerably expands on the support for networking and the included subset of the .NET Framework as compared to the original Silverlight release. If you've been following along as I've talked about the development of Silverlight, then this should all be known to you. The final version of Silverlight 2 is essentially the same as the earlier release candidate.