Pretty much spent every hour since the start trying to get the Farseer engine to work. My biggest and lengthiest hurdle was discovering and then fixing the fact that Silverlight uses a TopLeft coordinate system and Farseer use a center of object system. I probably would have figured it out faster, but I just happen to pick coordinates that interacted in a way that my small test box would hit the corner of the ground and bounce off spinning. Visibly the ground took up the bottom of the screen so it sent me on a wild goose chase looking for buggy forces.

PS. I’ve been Twittering as I work in a sort of experiment. If anyone else is, let me know and I’ll follow: http://twitter.com/MrPhilGames