Not directly related to mogre but is their anywhere I can get a bullet dll for bulletsharp without having to figure out how to build one myself.
I don't know of any binary bullet releases, but building bullet using cmake was surprisingly smooth for me, so give it a shot.
http://bulletphysics.org/mediawiki-1.5. ... om_scratch
You don't need to compile Bullet yourself, it's included in the BulletSharp dll.