ok, after everyone's responses I have some things clear...

-truespace has issues with animation when exporting for med
-milkshape has issues with animation when exporting for med
-wings3d does not have any animation when exporting either...

So now I have some other doubts...

-Do I have to animate with med?
-Is blender good for animating, and does it have any issues
whith skins/animations when exporting for med?
-Also... how do I go about exporting to med using blender, is
it some kind of plugin? If so, where can I get that plugin?