Now that Tabula Rasa is entering its final death rattle I wanted to make sure I got the soundtrack by Tracy Bush, Curse Mackey and Chris Vrenna with Clint Walsh, so I wrote a small extractor for the GLM format.
Now, as far as I can tell, a GLM file is just a sequence of either Ogg Vorbis or MP3 files put together, so my extractor only looks for those two file formats and splits them up into single files in the sequence it finds them in. There might be more to the format than that, and so I don't guarantee that it works correctly, but at least I've got my soundtrack to listen to.
Anyhow, here it is: http://dl.getdropbox.com/u/278272/TabulaRasaGLMExtractor.py
Just run it in a terminal and it should tell you how to use it.