Just so you know, my computer is a Mac OS X 10.5.7, and I am using Blender 2.48.
The guide says to run the script in blender's text editor. Since there is no ".md3" from the export menu, I load and run the script, but it says that there is a console error. Then it hilights the "import md3" part of the script.
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
![Confused :?](./images/smilies/icon_e_confused.gif)