This release is very unpolished but I wanted to get the new BeginComposite . . . EndComposite syntax in everyone's hands sooner rather than later.
I added a reference to RibbonControlsLibrary as a separate .dll. But I believe this comes standard now in .NET 4.0?
The other two dependencies are PresentationFramework.Aero and Rx (Reactive Framework). This is built for Windows 7/.NET 4.0 currently.