Nemyax, one of our fine modellers became very frustrated with having to revert to previous versions of Blender in order to export MD5 models, as there appeared to be no working MD5 exporter for the new versions of Blender. So he wrote his own!
We have already used it to get fully working MD5 monsters into Arx with total success. We hope this will be of benefit to someone here and all IDTech modders / modellers.
Download, feedback, discussion etc is available on the Kats Bits forum.