I have re-posted the Farseer Physics Silverlight Demos Here.
These demos were originally created for the XNA version of the Farseer Physics Engine. They were then ported to the Silverlight 2.0 Beta by Bill Reiss.
You can download the latest Farseer Physics Engine as well as the source code for these demos here.
Now that the the Silverlight 2.0 Beta is out I will try to get some updated demos posted soon.
Enjoy.