I was looking around for some info on animations and stumbled across a german forum. While I can't read german I was able to pick up on a few things and found this website. It tells you how to convert files from a *.blender to a *.bvh.
So, without any more babbling, here it is.
http://www.centralsource.com/blender/bvh/what.htm
You can get blender here if you don't already have it or haven't seen the other threads about it. It's a free alternative to Poser.
http://www.blender3d.org/
Enjoy, and happy animating!!