Bill Reiss (www.bluerosegames.com) and Andy Beaulieu (www.andybeaulieu.com) have submitted a video for the Mix 08 Show Off event.
The video hightlights the work each of them has done using the Farseer Physics Engine with Silverlight.
If you're going to Mix 08 look for it at the Show Off event. (Note: it still needs to make the "cut" to be part of the ShowOff video reel)
I'll try to get a link to the video after the Show Off event is over.