Here is a brief overview of what I made at Golaem with the Bullet Physics SDK:
A video showing it in action can be seen here: http://youtu.be/fKo-AsAvySk
In short, the soft is a crowd simulation software embedded within Maya, and the ragdoll part of our character was made thanks to Bullet Physics.
Thanks Erwinn for this beautiful tool
Next on the wish list would be multithread support for windows 64 bits platforms :p
You can see more about the software here: http://youtu.be/5YhPOntJtx0