MD3 Import and Export scripts for Blender 2.70
I think this will interest some modellers 
Drek MD3 Export Script (2.63 / 2.70)
http://forums.duke4.net/topic/5358-blender-26-md3-export-script/
MD3 Import/Export Scripts for Blender 2.69 (works with 2.70)
http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/MD3
I recommend to use Drek script for exporting, far more advanced and well supported.