I generated the needed files with spyd2en and then ran dispcal (OS X Tiger, Intel). Seems to be working fine!
Good to hear it is all hanging together.
Side question: I'm pretty new to Argyll, how can I create an ICC profile from the dispcal readings (cal file)?
Short answer is you can't, it's a separate couple of steps (Argyll's a bunch of tools). Look in doc/Scenarios.html#PM2 for an outline of the procedure. Basically it is 1) Create test points, 2) Read their value 3) make profile. Graeme Gill.