The first release candidate for Silverlight 2 has been posted. The release updates tool support for Visual Studio and Expression Blend. There are some breaking changes between Beta2 release and this release candiate. The end-user edition has not been posted to allow developers time to update applications before sites go live.
The RC includes three new core controls, ComboBox, ProgressBar, and PasswordBox, that have been added to the core Silverlight runtime.
For more information about the relase, see Scott Guthrie's blog entry, Silverlight 2 Release Candidate Now Available. He reports on new control skins that are more polished.