Silverlight 2 Beta 2 is out, read ScottGu's blog about this release on http://weblogs.asp.net/scottgu/archive/2008/06/06/silverlight-2-beta2-released.aspx.

Due to the imminent launch of the Silverlight Streaming ads trial program, the Silverlight Streaming service has not yet been updated to be fully functional with the Silverlight 2 Beta 2. As a direct consequence, Silverlight Streaming doesn’t work with Silverlight 2 Beta 2 applications yet. This is a temporary situation that we are working hard to address promptly.

It is important to note that the Silverlight 2 Beta 1 will time bomb 30 days from the Beta 2 release, at which point in time it will be necessary for you to have all your Silverlight 2 applications fully functional on the Beta 2 release.