Hey,
just wanted to mention a great tool for md-models:
http://www.misfitcode.com/misfitmodel3d/
Awesome tool, I was fighting with blenders md2 export (in my eyes that thing is hopelessly broken, complains about vertecies without UV maps but I have all sideds of my cube mapped, anyways, blender is a pain in the ass) and ended up searching for an alternative.
Does bone animations and frame based animations.
Models exported from it as md2 import flawlessly into jme.
Cheers