Chris Tavares from Microsoft Patterns & Practices mentioned a new source code drop for Unity that includes new project files for use with Silverlight. Apparently there are no changes in the code or bug fixes.
The new source code drop for Silverlight includes a modification that now includes ObjectBuilder 2.0, Unity, and the StaticFactoryExtension in a single assembly. I doubt most people use ObjectBuilder 2.0 on its own anymore anyway, so a single assembly called Microsoft.Practices.Unity that contains the original source code for ObjectBuilder 2.0, the original Unity Assembly, and the StaticFactoryExtension just makes things easier. You still have logical separation in the code.
You can download the new source code drop for Unity with the Silverlight Project here.
Feel free to check out the Unity Tutorials and Unity Screencasts as well.
Unity Screencasts: